Use -f to prevent errors.

kaspth · kaspth · commit f68b9be6467a · 2016-07-14T22:13:41.000+02:00
Nested Gemfiles need some more whacking.
diff --git a/.travis.yml b/.travis.yml
@@ -12,7 +12,7 @@ gemfile:
   - gemfiles/active_support_4.2.gemfile
   - gemfiles/active_support_5.0.gemfile
 before_install:
-  - "rm ${BUNDLE_GEMFILE}.lock"
+  - "rm -f ${BUNDLE_GEMFILE}.lock"
 matrix:
   fast_finish: true
   exclude:
