Remove stray character that hinded Travis cache
diff --git a/.travis.yml b/.travis.yml
index ae5f25a..90395ff 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -36,4 +36,4 @@
 
 before_cache:
   - rm $HOME/.gradle/caches/modules-2/modules-2.lock
-  - find $HOME/.gradle/wrapper -not -name "*-all.zip" -and -not -name "*.-bin.zip" -delete
+  - find $HOME/.gradle/wrapper -not -name "*-all.zip" -and -not -name "*-bin.zip" -delete