Remove .git$ from name when installing from URL

Support `omf install https://github.com/oh-my-fish/plugin-jump.git`

pkg/omf/cli/omf.install.fish

@@ -19,7 +19,7 @@ function omf.install -a name_or_url
     set name $name_or_url
     set url (cat $OMF_PATH/db/$parent_path/$name_or_url)
   else
-    set name (basename $name_or_url | sed "s/^pkg-//;s/^plugin-//;s/^theme-//")
+    set name (basename $name_or_url | sed 's/^pkg-//;s/^plugin-//;s/^theme-//;s/\.git$//')
     set url $name_or_url
   end