Bump some versions off alpha and compiler off beta now that async/await is stable

Author: jsdw

.travis.yml

@@ -4,7 +4,7 @@
 dist: trusty
 language: rust
 rust:
-  - beta
+  - stable
 services: docker
 sudo: required
 

CHANGELOG.md

@@ -1,9 +1,17 @@
+# 0.3.2
+
+## Improvements
+
+- Bump dependencies off alpha versions.
+- Use the stable Rust compiler now that `async`/`await` is stable.
+
 # 0.3.1
 
 ## Improvements
 
 - Bump compiler version to the latest Rust beta.
 - Bump dependencies.
+- Improve example output in `--help`.
 
 # 0.3.0