Update changelog style

Author: niklaskorz

CHANGELOG.md

@@ -1,14 +1,14 @@
-## 2.0.2 (2020-11-20)
+## v2.0.2 (2020-11-20)
 
 Fixes:
 - Set correct values for enum types (fixes #1)
 
-## 2.0.1 (2020-11-20)
+## v2.0.1 (2020-11-20)
 
 Fixes:
 - Import `google` namespace through `import type` instead of `import` to avoid compiler errors
 
-## 2.0.0 (2020-11-20)
+## v2.0.0 (2020-11-20)
 
 Breaking changes:
 - Moved declaration of `google.ima` namespace from global scope to module scope to avoid type clashes, it now has to be imported explicitly: `import type { google } from '@alugha/ima;`