prefer "github actions" to "travis ci"

Author: vladimiry

.github/workflows/main.yml

@@ -0,0 +1,20 @@
+name: "GitHub Actions CI"
+on: { push: { branches: [ master ] }, pull_request: { branches: [ master ] } }
+jobs:
+  lib:
+    if: github.event_name == 'push'
+    strategy: { matrix: { os: [ ubuntu-20.04, windows-2019, macos-10.15 ], node: [ 10, 12, 14, 15 ] }, fail-fast: false }
+    runs-on: ${{ matrix.os }}
+    steps:
+      - { uses: actions/setup-node@v1, with: { node-version: "${{ matrix.node }}" } }
+      - { uses: actions/checkout@v2 }
+      - name: lib
+        run: |
+          node --version
+          npm --version
+          yarn --version
+          npx envinfo
+          yarn --pure-lockfile --network-timeout 60000
+          yarn add rxjs@6
+          yarn add electron@12
+          yarn run lib

.travis.yml

@@ -1,6 +1,6 @@
 # electron-rpc-api
 
-[![Build Status](https://travis-ci.org/vladimiry/electron-rpc-api.svg?branch=master)](https://travis-ci.org/vladimiry/electron-rpc-api)
+[![GitHub Actions CI](https://github.com/vladimiry/electron-rpc-api/workflows/GitHub%20Actions%20CI/badge.svg?branch=master)](https://github.com/vladimiry/electron-rpc-api/actions)
 
 Is a wrapper around the Electron's IPC for building type-safe API based RPC-like and reactive interactions.