Add mod tests

Author: nk9

Syntax/Just.sublime-syntax

@@ -210,7 +210,7 @@ contexts:
         2: meta.generic-name.just
 
   modules:
-    - match: ^(mod)(\??)(\s+\w+)
+    - match: ^(mod)(\??)\s+({{valid_name}})
       scope: meta.statement.mod.just
       captures:
         1: keyword.control.import.just

Syntax/tests/syntax_test_just.include.just

@@ -20,5 +20,12 @@ mod foo2 'somewhere/else' # comment
 #        ^ string.quoted.single.just punctuation.definition.string.begin.just
 #         ^^^^^^^^^^^^^^^ string.quoted.single.just
 
+mod foo3 f'fail{{}}'
+#        ^^ invalid.illegal.just
+
+mod? foo4 """testme"""
+#    ^^^^ meta.statement.mod.just meta.generic-name.just
+#         ^^^^^^^^^^^^ string.quoted.double.block.just
+
 mod a `yes`
 #     ^ invalid.illegal.just