Merge pull request #48 from aj3sh/docs

Updated Changelog for release and fixed typo on contribution doc

Author: sugat009

CHANGELOG.md

@@ -11,7 +11,8 @@
 - Added method `strftime_ne` in `nepalidate` and `nepalidatetime` class and now `strftime` returns in en-US locale
 - Bug fix for Django templatetags
 - Added `CONTRIBUTION.md` file
-- Created class `nepalimonth` and `nepaliweek`.
+- Created class `nepalimonth` and `nepaliweek`
+- Created class `nepalinumber` supporting all numeric operations
 
 ## v0.5.6 - (July 7, 2022)
 - Test for automatic package publish

CONTRIBUTION.md

@@ -23,7 +23,7 @@ The config file for [`pre-commit`](https://pre-commit.com/) hooks is in [.pre-co
 
 A [.editorconfig](./editorconfig) is available to maintain the coding style. Besides, your code will automatically gets formatted if you have install the pre-commit hook.
 
-## Unitest
+## Unit tests
 
 Run the unittest using the below command: