feat(CI): check for trailing whitespace

Run on pull request only.
Use a shell script to check for trailing whitespace in all files.
Fail if trailing whitespace is found.

1 files changed, 1 insertions, 1 deletions

diff --git a/mrbgems/mruby-hash-ext/src/hash-ext.c b/mrbgems/mruby-hash-ext/src/hash-ext.c
index 6345420ed..9c85858fe 100644
--- a/mrbgems/mruby-hash-ext/src/hash-ext.c
+++ b/mrbgems/mruby-hash-ext/src/hash-ext.c
@@ -74,7 +74,7 @@ hash_slice(mrb_state *mrb, mrb_value hash)
  *     hsh.except(*keys) -> a_hash
  *
  *  Returns a hash excluding the given keys and their values.
- * 
+ *
  *     h = { a: 100, b: 200, c: 300 }
  *     h.except(:a)          #=> {:b=>200, :c=>300}
  *     h.except(:b, :c, :d)  #=> {:a=>100}