Retrict shebang snippet to BOL (#74)

* `bang` snippet only on first line

The `bang` (`#!`) snippet now only activates if the current line is 1
since that's the only place it works anyways.

Signed-off-by: MithicSpirit <[email protected]>

* Switch `bang` to checking if at beginning of line

Shebangs may be desired in the middle of a file occasionally.

Signed-off-by: MithicSpirit <[email protected]>

Author: MithicSpirit

fundamental-mode/bang

@@ -2,6 +2,7 @@
 # name: bang
 # key: #!
 # uuid: #!
+# condition: (bolp)
 # insert a choice if you have more than one possibility
 # --
 #!/usr/bin/env ${1:bash}