traivs: check for proper Cargo.* file names

.travis.yml

@@ -22,7 +22,7 @@ before_install:
   - |
     if [ "$TRAVIS_PULL_REQUEST" != "false" ]
       then
-      if ! git diff --name-only $TRAVIS_COMMIT_RANGE | grep -qE "(.rs|cargo.(lock|toml))$"
+      if ! git diff --name-only $TRAVIS_COMMIT_RANGE | grep -qE "(.rs|Cargo.(lock|toml))$"
         then
         echo "No changes to Rust or Cargo Files, CI not running."
         travis_terminate 0