Release version 1.2.0 (#175)

v1.2

Author: mwoss

CHANGELOG.md

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+## Decimal v1.2.0 
+
+#### BREAKING
+- Drop support for Go version older than 1.7 [#172](https://github.com/shopspring/decimal/pull/172)
+
+#### FEATURES
+- Add NewFromInt and NewFromInt32 initializers [#72](https://github.com/shopspring/decimal/pull/72)
+- Add support for Go modules [#157](https://github.com/shopspring/decimal/pull/157)
+- Add BigInt, BigFloat helper methods [#171](https://github.com/shopspring/decimal/pull/171)
+
+#### ENHANCEMENTS
+- Memory usage optimization [#160](https://github.com/shopspring/decimal/pull/160)
+- Updated travis CI golang versions [#156](https://github.com/shopspring/decimal/pull/156)
+- Update documentation [#173](https://github.com/shopspring/decimal/pull/173)
+- Improve code quality [#174](https://github.com/shopspring/decimal/pull/174)
+
+#### BUGFIXES
+- Revert remove insignificant digits [#159](https://github.com/shopspring/decimal/pull/159)
+- Remove 15 interval for RoundCash [#166](https://github.com/shopspring/decimal/pull/166)