Add changelog entry

Author: LefterisJP

changelog.MD

@@ -2,6 +2,11 @@
 
 The changelog starts from version 0.1.4 as too much was added in each version before that.
 
+## Version 0.1.8
+
+- Bugfix for [issue 8](https://github.com/ethereum/emacs-solidity/issues/8). Now if flycheck is not installed
+on the user's system there should be no errors or warnings.
+
 ## Version 0.1.7
 
 - Allow for customization of the way that emacs inserts comments into the source file via