Exclude "enum34" from "requirements.txt" file.

Author: KelSolaar

tasks.py

@@ -305,7 +305,8 @@ def requirements(ctx):
     """
 
     message_box('Exporting "requirements.txt" file...')
-    ctx.run('poetry run pip freeze | grep -v "github.com/colour-science" '
+    ctx.run('poetry run pip freeze | '
+            'egrep -v "github.com/colour-science|enum34" '
             '> requirements.txt')