Minor fixes to README

Fix README's Markdown syntax
Nit on trailing whitespace
Fix videos in the README
Keep iOS and Android consistent, in the README
Fix Gravizo chart with new syntax

many thanks to @veksen !

Bump version & display RN version in Readme

Maintain version

Upgrade to RN 0.41.2

Many thanks to @siemiatj

Notes: I had to upgrade my Android installation and my GenyMotion

Remove `all` references to Master Key for Parse server

Thanks @wookiem

Fixes #173

Remove `masterKey` from Parse setup #165

MasterKey is not required.

Fix README.md markdown syntax

PR #161 - Thanks @grifotv!

Support Parse Server on Heroku

See README for instructions on setting up Snowflake

See https://github.com/bartonhammond/snowflake-parse-heroku

Thanks to @wookiem for all the hard work!

Add chinese translation

Many thanks to #159 @tianling536

Fix Content.json

Fix #149 - Thanks @rbmedia - ios/snowflake/Images.xcassets/LaunchImage.launchimage/Content.json

Update Snowflake.png image, app icons and splash images

Many thanks to @rbmedia