Switch to Github Actions as the main CI platform

(cherry picked from commit cbb04ee)

Author: valeros

.github/workflows/examples.yml

@@ -0,0 +1,36 @@
+name: Examples
+
+on: [push]
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-16.04, windows-latest, macos-latest]
+        python-version: [2.7, 3.7]
+        example:
+          - "examples/arduino-asyncudp"
+          - "examples/arduino-blink"
+          - "examples/arduino-webserver"
+          - "examples/arduino-wifiscan"
+          - "examples/esp8266-nonos-sdk-blink"
+          - "examples/esp8266-rtos-sdk-blink"
+          - "examples/simba-blink"
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: "recursive"
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -U https://github.com/platformio/platformio/archive/develop.zip
+          platformio platform install file://.
+      - name: Build examples
+        run: |
+          platformio run -d ${{ matrix.example }}

.travis.yml

@@ -1,6 +1,6 @@
 # Espressif 8266: development platform for [PlatformIO](http://platformio.org)
-[![Build Status](https://travis-ci.org/platformio/platform-espressif8266.svg?branch=develop)](https://travis-ci.org/platformio/platform-espressif8266)
-[![Build status](https://ci.appveyor.com/api/projects/status/aob49qatio84iygj/branch/develop?svg=true)](https://ci.appveyor.com/project/ivankravets/platform-espressif8266/branch/develop)
+
+![alt text](https://github.com/platformio/platform-espressif8266/workflows/Examples/badge.svg "Espressif 8266 development platform")
 
 Espressif Systems is a privately held fabless semiconductor company. They provide wireless communications and Wi-Fi chips which are widely used in mobile devices and the Internet of Things applications.