CHANGELOG.md in rotp-3.3.1 vs CHANGELOG.md in rotp-4.0.0

@@ -1,10 +1,16 @@
 ### Changelog
 
+#### 4.0.0
+
+- Simplify API
+- Remove support for Ruby < 2.0
+
 #### 3.3.1
 
 - Add OpenSSL as a requirement for Ruby 2.5. Fixes #70 & #64
 - Allow Base32 with padding. #71
+- Prevent verify with drift being negative #69
 
 #### 3.3.0
 
 - Add digest algorithm parameter for non SHA1 digests - #62 from @btalbot