update .gitignore to the new MSVC build style
diff --git a/.gitignore b/.gitignore
index ccae001..20e85c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,8 +6,9 @@
*.gcno
*.gcov
*.lib
-Debug/
-Release/
+[Dd]ebug/
+[Rr]elease/
+/MSVC_*
.libs/
.coveralls.yml
coverage*/