return instead of exit

install.sh

@@ -52,8 +52,8 @@ function execute_miaou_lib {
 }
 
 function assert_bash {
-  if [[ $SHELL != bash ]]; then
-    >&2 echo "you are running on SHELL=$SHELL. Bash expected!"
+  if [[ $SHELL != 'bin/bash' ]]; then
+    >&2 echo "you are running on SHELL=$SHELL. 'bin/bash' expected!"
     return 11
   fi
 }