chore: cut release 0.3.0

Update README.
Update CHANGELOG.
Cut release 0.3.0.
Update keywords in Cargo.toml.

Author: indiv0

CHANGELOG.md

@@ -1,3 +1,15 @@
+<a name="v0.4.0"></a>
+## v0.4.0 (2017-11-21)
+
+
+#### Improvements
+
+*   switch to async API ([b6d2e9a2](https://github.com/indiv0/wolfram-alpha-rs/commit/b6d2e9a26dd2261a9bf3b2c530e0d3f85bd7ff56))
+*   remove unnecessary mut ([29858ced](https://github.com/indiv0/wolfram-alpha-rs/commit/29858ced9730c372eaea04cddc0eb135f402e2ce))
+*   replace `try!` with `?` ([d7059a30](https://github.com/indiv0/wolfram-alpha-rs/commit/d7059a300b13609a88b4bbfa626af65b67559265))
+
+
+
 <a name="v0.3.0"></a>
 ## v0.3.0 (2016-12-18)
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "wolfram_alpha"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Nikita Pekin <contact@nikitapek.in>"]
 description = "A library providing Rust bindings for the Wolfram|Alpha API"
 repository = "https://github.com/indiv0/wolfram-alpha-rs"
@@ -9,9 +9,10 @@ readme = "README.md"
 keywords = [
     "wolfram",
     "alpha",
+    "async",
     "API",
-    "web",
     "library",
+    "web",
 ]
 license = "MIT/Apache-2.0"
 include = [

README.md

@@ -30,7 +30,7 @@ Add the following to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-wolfram_alpha = "0.3"
+wolfram_alpha = "0.4"
 ```
 
 And in your `lib.rs` or `main.rs`:
@@ -39,7 +39,8 @@ And in your `lib.rs` or `main.rs`:
 extern crate wolfram_alpha;
 ```
 
-See the [API docs][api-docs] for information on using the crate in your library.
+See the [API docs][api-docs] for information on using the crate in your library,
+or take a look at an example in the [examples][examples] directory.
 
 ## Contributing
 
@@ -64,7 +65,8 @@ Apache License (Version 2.0).
 
 See [LICENSE-APACHE][license-apache], and [LICENSE-MIT][license-mit] for details.
 
-[api-docs]: https://indiv0.github.io/wolfram-alpha-rs/wolfram_alpha
+[api-docs]: https://indiv0.github.io/wolfram-alpha-rs/wolfram_alpha "API Documentation"
+[examples]: https://github.com/indiv0/wolfram-alpha-rs/tree/master/examples "Examples"
 [contributing]: https://github.com/indiv0/wolfram-alpha-rs/blob/master/CONTRIBUTING.md "Contribution Guide"
 [contributors]: https://github.com/indiv0/wolfram-alpha-rs/blob/master/CONTRIBUTORS.md "List of Contributors"
 [license-apache]: https://github.com/indiv0/wolfram-alpha-rs/blob/master/LICENSE-APACHE "Apache-2.0 License"