feat(changelog): Use clog for changelogs

.clog.toml

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+[clog]
+
+repository = "https://github.com/rust-lang/rustlings"
+changelog = "CHANGELOG.md"

CHANGELOG.md

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+<a name="1.3.0"></a>
+### 1.3.0 (2019-06-05)
+
+#### Features
+
+- Adds a simple exercise for structures (#163, @briankung)
+
+#### Bug Fixes
+
+- Add Result type signature as it is difficult for new comers to understand Generics and Error all at once. (#157, @veggiemonk)
+- Rustfmt and whitespace fixes (#161, @eddyp)
+- errorsn.rs: Separate also the hints from each other to avoid accidental viewing (#162, @eddyp)
+- fixed outdated links (#165, @gushroom)
+- Fix broken link (#164, @HanKruiger)
+- Remove highlighting and syntect (#167, @komaeda)
+
+<a name="1.2.2"></a>
+### 1.2.2 (2019-05-07)
+
+#### Bug Fixes
+
+- Reverted `--nocapture` flag since it was causing tests to pass unconditionally
+
+<a name="1.2.1"></a>
+### 1.2.1 (2019-04-22)
+
+#### Bug Fixes
+
+- Fix the `--nocapture` feature (@komaeda)
+- Provide a nicer error message for when you're in the wrong directory
+
+<a name="1.2.0"></a>
+### 1.2.0 (2019-04-22)
+
+#### Features
+
+- Add errors to exercises that compile without user changes (@yvan-sraka)
+- Use --nocapture when testing, enabling `println!` when running (@komaeda)
+
+<a name="1.1.1"></a>
+### 1.1.1 (2019-04-14)
+
+#### Bug fixes
+
+- Fix permissions on exercise files (@zacanger, #133)
+- Make installation checks more thorough (@komaeda, 1b3469f236bc6979c27f6e1a04e4138a88e55de3)
+- Fix order of true/false in tests for executables (@mgeier, #137)
+- Stop run from panicking when compile fails (@cjpearce, #141)
+- Fix intermittent test failure caused by race condition (@cjpearce, #140)
+- Fix links by deleting book version (@diodfr, #142)
+- Canonicalize paths to fix path matching (@cjpearce, #143)
+
+<a name="1.1.0"></a>
+### 1.1.0 (2019-03-20)
+
+- errors2.rs: update link to Rust book (#124)
+- Start verification at most recently modified file (#120)
+- Watch for file creation events in watch mode (#117)
+- Add standard library types to exercises suite (#119)
+- Give a warning when Rustlings isn't run from the right directory (#123)
+- Verify that rust version is recent enough to install Rustlings (#131)
+
+<a name="1.0.1"></a>
+### 1.0.1 (2019-03-06)
+
+- Adds a way to install Rustlings in one command (`curl -L https://git.io/rustlings | bash`)
+- Makes `rustlings watch` react to create file events (@shaunbennett, #117)
+- Reworks the exercise management to use an external TOML file instead of just listing them in the code
+
+<a name="1.0.0"></a>
+### 1.0.0 (2019-03-06)
+
+Initial release.