Switch CI to GitHub actions

This loses the publication to gh-pages, but that all predates docs.rs...

Author: alexcrichton

.github/workflows/main.yml

@@ -0,0 +1,16 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust: [stable, beta, nightly]
+    steps:
+    - uses: actions/checkout@master
+    - name: Install Rust
+      run: rustup update ${{ matrix.rust }} && rustup default ${{ matrix.rust }}
+    - run: cargo test
+    - run: cargo doc

.travis.yml

@@ -3,9 +3,7 @@ getopts
 
 A Rust library for option parsing for CLI utilities.
 
-[![Build Status](https://travis-ci.org/rust-lang-nursery/getopts.svg?branch=master)](https://travis-ci.org/rust-lang-nursery/getopts)
-
-[Documentation](https://doc.rust-lang.org/getopts)
+[Documentation](https://docs.rs/getopts)
 
 ## Usage
 
@@ -16,12 +14,6 @@ Add this to your `Cargo.toml`:
 getopts = "0.2"
 ```
 
-and this to your crate root:
-
-```rust
-extern crate getopts;
-```
-
 ## Rust Version Support
 
 The minimum supported Rust version is 1.18.