Update build badge for GitHub Actions

.github/workflows/build-app-workflow.yaml

@@ -1,4 +1,4 @@
-name: Build
+name: build
 on: [pull_request, push]
 jobs:
   build:
@@ -7,4 +7,4 @@ jobs:
       - name: Checkout the code
         uses: actions/checkout@v2
       - name: Build the app
-        run: ./gradlew build
+        run: ./gradlew build

README.md

@@ -1,7 +1,7 @@
 <img align="left" width="80" height="80" src="metadata/en-US/images/icon.png"
 alt="App icon">
 
-# Aegis Authenticator [![CI](https://api.travis-ci.org/beemdevelopment/Aegis.svg?branch=master)](https://travis-ci.org/github/beemdevelopment/aegis) [![Crowdin](https://badges.crowdin.net/aegis-authenticator/localized.svg)](https://crowdin.com/project/aegis-authenticator) [![Donate](https://img.shields.io/badge/donate-buy%20us%20a%20beer-%23FF813F)](https://www.buymeacoffee.com/beemdevelopment) [![Matrix](https://img.shields.io/badge/chat-Matrix-blue)](https://matrix.to/#/#aegis:matrix.org)
+# Aegis Authenticator [![CI](https://github.com/beemdevelopment/Aegis/workflows/build/badge.svg)](https://github.com/beemdevelopment/Aegis/actions?query=workflow%3Abuild) [![Crowdin](https://badges.crowdin.net/aegis-authenticator/localized.svg)](https://crowdin.com/project/aegis-authenticator) [![Donate](https://img.shields.io/badge/donate-buy%20us%20a%20beer-%23FF813F)](https://www.buymeacoffee.com/beemdevelopment) [![Matrix](https://img.shields.io/badge/chat-Matrix-blue)](https://matrix.to/#/#aegis:matrix.org)
 
 __Aegis Authenticator__ is a free, secure and open source 2FA app for Android.
 It aims to provide a secure authenticator for your online services, while also