update changelog for 0.15

CHANGELOG.md

@@ -6,6 +6,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.15.0] - 2019-10-21
+
+### Changed
+- Undeprecate `iter` methods
+- Library no longer has any dependencies
+
+### Added
+- Support for variables with a `.` in their name
+- Support `\n` in double-quoted lines
+- Support for variable substitution
+
 ## [0.14.1] - 2019-05-14
 
 ### Changed
@@ -19,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 
 
-[Unreleased]: https://github.com/dotenv-rs/dotenv/compare/v0.14.1...HEAD
+[Unreleased]: https://github.com/dotenv-rs/dotenv/compare/v0.15.0...HEAD
+[0.15.0]: https://github.com/dotenv-rs/dotenv/compare/v0.14.1...v0.15.0
 [0.14.1]: https://github.com/dotenv-rs/dotenv/compare/v0.14.0...v0.14.1
 [0.14.0]: https://github.com/dotenv-rs/dotenv/compare/v0.13.0...v0.14.0