Added CHANGELOG

Author: iamWing

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [Unreleased]
+
+## [2020.06.18]
+### Added
+- `iputils-ping` package in dockerfiles to allow ping.
+- Vim terminal windows size setting - set to `20x0`.
+- NERDTree settings for following features:
+  - Open automatically when vim starts up with no file specified.
+  - Close vim if the only window left open is NERDTree.
+  - Show hidden files by default but hide folder `.git`, `.DS_Store` and
+`.swp` files.
+
+### Fixed
+- Issue of `pipenv` returns `Failed to load paths: /bin/sh: 1: .../python: not 
+found` by pinning the `pipenv` version to `2018.11.26`.
+
+## [2020.06.17]
+### Added
+- `.vimrc` configured for Python developemnt.
+- Ubuntu 20.04 based dockerfiles to build images for Python 3.7 & 3.8 variants.
+
+[Unreleased]: https://github.com/devtography/pyvim/compare/2020.06.18...HEAD
+[2020.06.18]: https://github.com/devtography/pyvim/compare/2020.06.17...2020.06.18
+[2020.06.17]: https://github.com/devtography/pyvim/releases/tag/2020.06.17