chore: Removed Travis CI integration (#326)

Author: hiranya911

.github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: Go Continuous Integration
+name: Continuous Integration
 on: [push, pull_request]
 jobs:
 
@@ -22,7 +22,7 @@ jobs:
       uses: actions/checkout@v2
       with:
         path: go/src/firebase.google.com/go
-    
+
     - name: Get dependencies
       run: go get -t -v $(go list ./... | grep -v integration)
 
@@ -43,7 +43,7 @@ jobs:
           echo "Go code is not formatted:"
           gofmt -d -s .
           exit 1
-        fi 
+        fi
 
     - name: Run Static Analyzer
       run: go vet -v firebase.google.com/go/...

.travis.gofmt.sh

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/firebase/firebase-admin-go.svg?branch=master)](https://travis-ci.org/firebase/firebase-admin-go)
+[![Build Status](https://github.com/firebase/firebase-admin-go/workflows/Continuous%20Integration/badge.svg)](https://github.com/firebase/firebase-admin-go/actions)
 [![GoDoc](https://godoc.org/firebase.google.com/go?status.svg)](https://godoc.org/firebase.google.com/go)
 [![Go Report Card](https://goreportcard.com/badge/github.com/firebase/firebase-admin-go)](https://goreportcard.com/report/github.com/firebase/firebase-admin-go)
 
@@ -42,7 +42,7 @@ requests, code review feedback, and also pull requests.
 ## Supported Go Versions
 
 We support Go v1.11 and higher.
-[Continuous integration](https://travis-ci.org/firebase/firebase-admin-go) system
+[Continuous integration](https://github.com/firebase/firebase-admin-go/actions) system
 tests the code on Go v1.11 through v1.13.
 
 ## Documentation