return instead of exit

install.sh

@@ -3,6 +3,7 @@
 ## CONSTANTS
 
 BASE_ARCHIVE_URL='https://git.artcode.re/miaou/miaou-bash/archive'
+BASH_SHELL='/bin/bash'
 
 ## FUNCTIONS
 
@@ -52,8 +53,8 @@ function execute_miaou_lib {
 }
 
 function assert_bash {
-  if [[ $SHELL != 'bin/bash' ]]; then
-    >&2 echo "you are running on SHELL=$SHELL. 'bin/bash' expected!"
+  if [[ $SHELL != "$BASH_SHELL" ]]; then
+    >&2 echo "you are running on SHELL=$SHELL. expectation: $BASH_SHELL"
     return 11
   fi
 }