Update README.md (#344)

tkgauri · imasahiro · commit f7d2b7618cf0 · 2019-06-17T12:12:03.000+09:00
diff --git a/README.md b/README.md
@@ -125,7 +125,7 @@ See http://semver.org/.
 
 ## Contributing
 
-Please check [CONTRIBUTING](contributing.md) before making a contribution.
+Please check [CONTRIBUTING](CONTRIBUTING.md) before making a contribution.
 
 
 ## License
