Merge pull request gruntwork-io#11 from macbutch/fix-shebang

Fix incorrect shebang detection

Author: brikis98

hooks/shellcheck.sh

@@ -10,7 +10,7 @@ export PATH=$PATH:/usr/local/bin
 exit_status=0
 
 for file in "$@"; do
- if (head -1 "$file" |grep '^#!.*[sh]'>/dev/null); then
+ if (head -1 "$file" |grep '^#!.*sh'>/dev/null); then
 
     if ! shellcheck "$file"; then
         exit_status=1