Add link to changelog entry for #160 PR

Author: lehins

CHANGELOG.md

@@ -1,6 +1,6 @@
 # 1.3.0
 
-* Add `SplitGen` and `splitGen`
+* Add `SplitGen` and `splitGen`: [#160](https://github.com/haskell/random/pull/160)
 * Add `shuffleList` and `shuffleListM`: [#140](https://github.com/haskell/random/pull/140)
 * Add `mkStdGen64`: [#155](https://github.com/haskell/random/pull/155)
 * Add `uniformListRM`, `uniformList`, `uniformListR`, `uniforms` and `uniformRs`: