Add GitHub Actions CI and update README

.github/workflows/ci.yml

@@ -0,0 +1,64 @@
+on: [push, pull_request]
+
+name: Continuous integration
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: check
+
+  test:
+    name: Test Suite
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: rustup component add rustfmt
+      - uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+      - run: rustup component add clippy
+      - uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: -- -D warnings

Cargo.toml

@@ -9,6 +9,3 @@ readme = "README.md"
 documentation = "https://pyfisch.github.io/httpdate/httpdate/index.html"
 repository = "https://github.com/pyfisch/httpdate"
 edition = "2018"
-
-[features]
-unstable = []

README.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://travis-ci.org/pyfisch/httpdate.svg?branch=master)](https://travis-ci.org/pyfisch/httpdate)
 [![Crates.io](https://img.shields.io/crates/v/httpdate.svg)](https://crates.io/crates/httpdate)
-[Documentation](https://pyfisch.github.io/httpdate/httpdate/index.html)
+[![Documentation](https://docs.rs/httpdate/badge.svg)](https://docs.rs/httpdate)
 
 Multiple HTTP header fields store timestamps.
 For example a response created on May 15, 2015 may contain the header
@@ -16,6 +16,11 @@ This crate provides two public functions:
 * `parse_http_date` to parse a HTTP datetime string to a system time
 * `fmt_http_date` to format a system time to a IMF-fixdate
 
+In addition it exposes the `HttpDate` type that can be used to parse
+and format timestamps. Convert a sytem time to `HttpDate` and vice versa.
+The `HttpType` (8 bytes) is smaller than `SystemTime` (16 bytes) and
+using the display impl avoids a temporary allocation.
+
 Read the [blog post](https://pyfisch.org/blog/http-datetime-handling/) to learn
 more.