Update changelog

Signed-off-by: Yoshua Wuyts <[email protected]>

Author: yoshuawuyts

CHANGELOG.md

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+## 2019-06-24, Version 3.0.0
+### Commits
+- [[`6751357025`](https://github.com/rustasync/async-datagram/commit/6751357025399b02c48c21538b48141999ea10ed)] (cargo-release) version 3.0.0 (Yoshua Wuyts)
+- [[`cceff70e1e`](https://github.com/rustasync/async-datagram/commit/cceff70e1e0d90de6e1eb8e33bc30cdd33431887)] Remove #![feature(futures_api)] (#2) (Taiki Endo)
+- [[`4494fc2ec6`](https://github.com/rustasync/async-datagram/commit/4494fc2ec6ae7487c5377dbb9a3b42efc10216bf)] (cargo-release) version 2.2.0 (Yoshua Wuyts)
+- [[`7e76d87cf7`](https://github.com/rustasync/async-datagram/commit/7e76d87cf7d6b68804e55fc055ebd8812e41ea10)] (cargo-release) version 2.1.0 (Yoshua Wuyts)
+- [[`110d365508`](https://github.com/rustasync/async-datagram/commit/110d36550863c86452ebb166b9cf0de24ea9e223)] new futures api (#1) (Yoshua Wuyts)
+- [[`fab2b61ca4`](https://github.com/rustasync/async-datagram/commit/fab2b61ca42076716374b6af81ed62653f804e7b)] move to rustasync (Yoshua Wuyts)
+- [[`7d1aeb7b1b`](https://github.com/rustasync/async-datagram/commit/7d1aeb7b1bc1f645e4d0e125e87bf23e5420784d)] (cargo-release) version 2.0.0 (Yoshua Wuyts)
+- [[`26c2c1596d`](https://github.com/rustasync/async-datagram/commit/26c2c1596dc28cadc6ceb20f406951919b7f7be7)] update docs (Yoshua Wuyts)
+- [[`bb23e024db`](https://github.com/rustasync/async-datagram/commit/bb23e024db9dda16ecf6d635515c420bd0230390)] improve traits (Yoshua Wuyts)
+- [[`ea6b82547e`](https://github.com/rustasync/async-datagram/commit/ea6b82547efe01e949ea90bd5a91cabdb13fd4a4)] . (Yoshua Wuyts)
+
+### Stats
+```diff
+ .github/CODE_OF_CONDUCT.md                |  75 ++++++++++++-
+ .github/CONTRIBUTING.md                   |  63 ++++++++++-
+ .github/ISSUE_TEMPLATE.md                 |   9 +-
+ .github/ISSUE_TEMPLATE/bug_report.md      |  23 ++++-
+ .github/ISSUE_TEMPLATE/feature_request.md |  43 +++++++-
+ .github/ISSUE_TEMPLATE/question.md        |  18 +++-
+ .github/PULL_REQUEST_TEMPLATE.md          |  21 +++-
+ .github/stale.yml                         |  17 +++-
+ .gitignore                                |   7 +-
+ .travis.yml                               |  13 ++-
+ Cargo.toml                                |  16 +++-
+ LICENSE-APACHE                            | 190 +++++++++++++++++++++++++++++++-
+ LICENSE-MIT                               |  21 +++-
+ README.md                                 |  78 +++++++++++++-
+ rustfmt.toml                              |   2 +-
+ src/error.rs                              |  73 ++++++++++++-
+ src/lib.rs                                |  75 ++++++++++++-
+ tests/test.rs                             |   1 +-
+ 18 files changed, 745 insertions(+)
+```
+
+