workflow: update trigger and build badge

Signed-off-by: Rui Chen <[email protected]>

.github/workflows/ci.yml

@@ -1,6 +1,12 @@
 name: ci
 
-on: pull_request
+on:
+  push:
+    branches:
+      - 'master'
+  pull_request:
+    branches:
+      - 'master'
 
 jobs:
   build:

README.md

@@ -2,7 +2,7 @@
 
 # Statuspage
 
-[![Build Status](https://travis-ci.org/jayfk/statuspage.svg?branch=master)](https://travis-ci.org/jayfk/statuspage)
+[![ci](https://github.com/jayfk/statuspage/actions/workflows/ci.yml/badge.svg)](https://github.com/jayfk/statuspage/actions/workflows/ci.yml)
 [![codecov.io](https://codecov.io/github/jayfk/statuspage/coverage.svg?branch=master)](https://codecov.io/github/jayfk/statuspage?branch=master)
 
 A statuspage generator that lets you host your statuspage for free on GitHub. Uses