Update CHANGELOG.md

fixed versioning(v0.1.1 to UNRELEASED)

Author: JoshuaKento

CHANGELOG.md

@@ -7,7 +7,7 @@ Semantic Versioning. Prior to 1.0.0, MINOR (0.x.0) may include breaking
 changes, while PATCH (0.1.x) is reserved for backwards-compatible fixes
 and small additions.
 
-## [0.1.1]
+## [UNRELEASED]
 
 ### Added
 - Added Basic Documention by way of "cargo doc".
@@ -57,6 +57,6 @@ and small additions.
 - Public API is not stabilized and may change between 0.x releases.
 
 <!-- Update links if the repository slug changes. -->
-[0.1.1]: https://github.com/joushuakent/rust-fuzzylogic/compare/v0.1.1
+[UNRELEASED]: https://github.com/joushuakent/rust-fuzzylogic/compare/UNRELEASED
 [0.1.0]: https://github.com/joushuakent/rust-fuzzylogic/releases/tag/v0.1.0