Fix uninstall for osx

uninstall.sh

@@ -1,7 +1,15 @@
 #!/bin/sh
 # uninstall by (github: bernardofire)
 # Remove line from bashrc and zshrc if present.
+
+sed="sed -i"
+if [[ $OSTYPE == "Darwin" ]]; then
+  sed="sed -i ''"
+fi
+
 for rc in bashrc zshrc; do
-  sed -i '/scm_breeze/d' "$HOME/.$rc"
+  if [ -f "$HOME/.$rc" ]; then
+    $sed '/scm_breeze/d' "$HOME/.$rc" &&
       printf "Removed SCM Breeze from %s\n" "$HOME/.$rc"
+  fi
 done