updated travis checking via shellcheck

.travis.yml

@@ -3,16 +3,9 @@ language: bash
 # Use container-based infrastructure for quicker build start-up
 sudo: false
 
-addons:
-  apt:
-    sources:
-    - debian-sid    # Grab shellcheck from the Debian repo
-    packages:
-    - shellcheck
-
 script:
- - bash -c 'shopt -s globstar; shellcheck rssh'
+  - shellcheck $(grep -rIzl '^#![[:blank:]]*/bin/sh' ./ | grep .git -v | cat)
+  - shellcheck $(grep -rIzl '^#![[:blank:]]*/bin/bash' ./ | grep .git -v | cat)
 
 matrix:
   fast_finish: true
-