Switch to GitHub actions for CI

We can't test on windows right now because the test runner
uses bats, which is a bash testing framework as well as python3,
which is not set up by default on windows.

.github/workflows/run-tests.yml

@@ -0,0 +1,20 @@
+name: Run PR Checks
+on:
+  push:
+  pull_request:
+jobs:
+  run-tests:
+    name: Run Tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        go-version: [1.17, 1.16, 1.15]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go-version }}
+    - name: Build and test
+      run: make

.travis.yml

@@ -1,9 +0,0 @@
-language: go
-
-go:
-  - 1.5
-
-install:
- - go build jp.go
-
-script: make test

Makefile

@@ -1,8 +1,10 @@
 JP_VERSION=""
 
-help:
-	@echo "Please use \`make <target>' where <target> is one of"
-	@echo "  test     to run all the tests."
+
+all: build test
+
+build:
+	go build ./...
 
 test:
 	# CLI specific test cases.
@@ -31,4 +33,4 @@ new-release:
 	scripts/build-all-platforms
 	scripts/sign-all
 
-.PHONY: help test
+.PHONY: help test build