update changelog. (#15)

Author: gyanesh-m

CHANGELOG.md

@@ -5,6 +5,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [UNRELEASED][unreleased]
 
+## [1.0.0][1.0.0]
+
+### Added
+* support for nper with examples
+
+### Changed
+* Replace floats with decimal
+
+### Fixed
+* Fix PMT, 0 rate case
+* Fix IPMT
+
 ## [0.2.0][0.2.0]
 
 ### Added 
@@ -21,6 +33,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * support for fv, ipmt, pmt, ppmt functions.
 * support for amortisation table generation.
 
-[unreleased]: https://github.com/razorpay/go-financial/compare/v0.2.0...master
+[unreleased]: https://github.com/razorpay/go-financial/compare/v1.0.0...master
 [0.1.0]: https://github.com/razorpay/go-financial/releases/tag/v0.1.0
 [0.2.0]: https://github.com/razorpay/go-financial/releases/tag/v0.2.0
+[1.0.0]: https://github.com/razorpay/go-financial/releases/tag/v1.0.0