replaced Travis CI with GitHub Actions

Travis seems flakey lately and is generally less convenient

note that ESLint v6+ no longer supports Node v8.9, so we'll just skip
tests for legacy versions (see `lib/util/resolve.js` for why that's
relevant)

.editorconfig

@@ -11,7 +11,7 @@ max_line_length = 80
 indent_style = tab
 indent_size = 4
 
-[*.md]
+[*.{md,yml}]
 indent_style = space
 
 [COMMIT_EDITMSG]

.github/workflows/nodejs.yml

@@ -0,0 +1,19 @@
+name: tests
+on:
+- push
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                node-version:
+                - 8.x
+                - 12.x
+        steps:
+        - uses: actions/checkout@v1
+        - uses: actions/setup-node@v1
+          with:
+              node-version: ${{ matrix.node-version }}
+        - run: npm install-test
+          env:
+              CI: true

README.md

@@ -2,7 +2,7 @@ faucet-pipeline-core
 ====================
 
 [![npm](https://img.shields.io/npm/v/faucet-pipeline-core.svg)](https://www.npmjs.com/package/faucet-pipeline-core)
-[![build status](https://travis-ci.org/faucet-pipeline/faucet-pipeline-core.svg?branch=master)](https://travis-ci.org/faucet-pipeline/faucet-pipeline-core)
+[![build status](https://github.com/faucet-pipeline/faucet-pipeline-core/workflows/tests/badge.svg)](https://github.com/faucet-pipeline/faucet-pipeline-core/actions)
 [![Greenkeeper badge](https://badges.greenkeeper.io/faucet-pipeline/faucet-pipeline-core.svg)](https://greenkeeper.io)
 
 See [faucet-pipeline.org](https://www.faucet-pipeline.org) for documentation.