thodg/totp-rs

diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,98 @@
-# [v1.0](https://github.com/constantoine/totp-rs/releases/tag/v1.0)
+# [3.1](https://github.com/constantoine/totp-rs/releases/tag/v3.1) (03/11/2022)
+### What's new
+- `get_qr()` now returns a `String` as an error.
+- `TOTP` now implements `core::fmt::Display`
+- `Rfc6238Error` and `TotpUrlError` now implement `std::error::Error`
+
+### CI
+- Add better coverage thanks to `llvm-tools-preview` and `grcov`
+
+### Style
+- Finally `cargo fmt`'d the whole repo
+
+### Special thanks
+* [@tmpfs](https://github.com/tmpfs)  for making me notice #41.
+
+# [3.0.1](https://github.com/constantoine/totp-rs/releases/tag/v3.0.1) (13/08/2022)
+### Fixes
+* `TotpUrlError` was unexported. This is now fixed. (#29)
+* `base32` was reexported instead. It is now private, and will need to be an explicit dependency for the user to encore/decode base32 data.
+
+### Changes
+* `Secret` comparison is now done in constant time.
+
+### Special thanks
+* [@alexanderkja](https://github.com/alexanderkjall) for discovering #29.
+
+# [3.0](https://github.com/constantoine/totp-rs/releases/tag/v3.0) (09/08/2022)
+### New features
+* Secret handling is now less error prone thanks to #25
+* Totp now implements the `Default` trait, which will generate a strong secret, and have sane default values according to RFC-6238 like #26
+* `Rfc6238` struct is exposed for easy Totp building
+* `Totp.ttl` convenience method will tell remaining validity time of token (not taking skew into account)
+
+### New dependency
+* [gen_secret] uses `rand` to generate a secret
+
+### Breaking
+* TotpUrlError now contain a string explaining. Inspired by #23
+* Totp fields `issuer` and `account_name` won't be present anymore if feature `otpauth` isn't enabled
+* The secret and digits field will now be validated for SecretSize (>= 128 bits)
+
+### Special thanks
+* [@sacovo](https://github.com/sacovo)for opening #23, from which the TotpUrlError rework was inspired
+* [@steven89](https://github.com/steven89) for the tremendous work and back and forth provided with #24 #25 and #26 
+
+## Note
+This has been, I think, the update containing the most work. While a lot of unit testing have been done, and test cases added, coverage seems to have dropped. Please report any issue encountered while updating totp-rs to 3.0.0
+
+# [2.1](https://github.com/constantoine/totp-rs/releases/tag/v2.1) (16/06/2022)
+### New dependency
+* [otpauth] now uses `urlencoding`, which has no dependencies, to url-encode and url-decode values. Because doing this with the `url` library was kind of awkward.
+
+### Fixes
+* Bug where your issuer would be incorrectly prefixed with a /, and comparison with the issuer parameter would fail.
+* Bug where the issuer and account name in path would not be correctly url decoded in path, but correctly decoded in url query.
+
+### Special thanks
+@wyhaya for discovering the first problem in #21 
+
+# [2.0](https://github.com/constantoine/totp-rs/releases/tag/v2.0) (30/05/2022)
+### What changed
+- `issuer` and `account_name` are now members of TOTP, and thus are not used anymore as function parameters for methods
+- `from_url()` now extracts issuer and label
+- Method `get_url()` now needs `otpauth` feature
+- Method `get_url()` now produces more correct urls
+- Methods `next_step(time: u64)` and `next_step_current` will return the timestamp of the next step's start
+- Feature `qr` enables feature `otpauth`
+
+### Special thanks
+- @wyhaya for giving ideas and feedback for this release
+
+# [1.4](https://github.com/constantoine/totp-rs/releases/tag/v1.4) (06/05/2022)
+## What's changed
+* Added url dependency for `otpauth` feature, which adds a `from_url` function to parse a `TOTP` object from url. Thanks to @wyhaya (https://github.com/constantoine/totp-rs/pull/19)
+
+# [1.3](https://github.com/constantoine/totp-rs/releases/tag/v1.3) (06/05/2022)
+## What's changed
+* Added helper functions `generate_current` and  `check_current`. Thanks to @wyhaya (https://github.com/constantoine/totp-rs/pull/17)
+* Clarified output format of get_qr in the docs
+
+# [1.2.1](https://github.com/constantoine/totp-rs/releases/tag/v1.2.1) (05/05/2022)
+## What's changed
+* Disabled default image features to only enable png
+
+# [1.2](https://github.com/constantoine/totp-rs/releases/tag/v1.2) (05/05/2022)
+## What's changed
+* Bumped "image" version to 0.24
+* Removed "qrcode" library, which was abandoned years ago, to "qrcodegen", which is actively maintained
+
+# [1.1](https://github.com/constantoine/totp-rs/releases/tag/v1.1) (24/04/2022)
+## What's changed
+* Mitigated possible timing attack as noticed per @gleb-chipiga in https://github.com/constantoine/totp-rs/issues/13
+* Added PartialEq support for TOTP<T> and PartialEq + Eq support for Algorithm, suggestion from @gleb-chipiga in https://github.com/constantoine/totp-rs/issues/14
+
+# [1.0](https://github.com/constantoine/totp-rs/releases/tag/v1.0) (15/04/2022)
 ## What's Changed
 * Fixed wrongful results using hmac-256 and hmac-512 thanks to @ironhaven extensive researches within RFC's in https://github.com/constantoine/totp-rs/pull/12