[readme] add the actions badge

Author: apalala

Diff for: .github/workflows/default.yml

@@ -5,6 +5,9 @@ name: tests
 
 on:
   - pull_request
+  push:
+    branches:
+      master
 
 jobs:
   build:

Diff for: README.md

@@ -2,6 +2,7 @@
 ![version](https://img.shields.io/pypi/pyversions/late.svg)
 ![fury](https://badge.fury.io/py/Late.svg)
 ![downloada](https://img.shields.io/pypi/dm/Late.svg)
+![actions](https://github.com/neogeny/Late/workflows/tests/badge.svg)
 
 # Late
 Late binding for Python default arguments