rn-49: Added a few links in "Other News" section

Author: jnareb

rev_news/drafts/edition-49.md

@@ -146,8 +146,37 @@ __Various__
  requirement is to be willing to learn and contribute to the JGit or Gerrit
  Code Review project.
 
+* Google [is creating](https://opensource.googleblog.com/2019/03/introducing-season-of-docs.html)
+ a project aimed at improving OSS projects documentation:
+[Season of Docs 2019](https://developers.google.com/season-of-docs/).
+ Mentoring organizations can begin submitting applications to Google
+ on April 2, 2019.
+
+
 __Light reading__
 
+*[Redesigning Github repository page](http://tonsky.me/blog/github-redesign/)
+ by Nikita Prokopov describes how the author would have changed the design.
+
+*[Write yourself a Git!](https://wyag.thb.lt/) by Thibault Polge is
+ an attempt at explaining the Git version control system from the
+ bottom up, that is, starting at the most fundamental level moving up
+ from there. All it takes to understand Git internals is to
+ reimplement Git from scratch in exactly 503 lines of very simple
+ Python code.
+
+*[10 Git Commands You Should Know; Plus tips to save time with Git](https://towardsdatascience.com/10-git-commands-you-should-know-df54bea1595c)
+ by Jeff Hale.
+
+*[Git hacks you should know about](https://dev.to/teamxenox/git-hacks-you-should-know-about-16pk)
+ by Ankur Biswas; most of these is a regular workflow stuff, though
+ (and you need to take care as some of commands rewrite history).
+
+*[Data Versioning](https://emilygorcenski.com/post/data-versioning/)
+ by Emily Gorcenski identifies four key axes on which machine
+ learning systems have a notion of version along with some brief
+ recommendations for how to simplify it a bit.
+
 
 __Git tools and sites__
 
@@ -163,6 +192,18 @@ __Git tools and sites__
  can help you "Learn Git fast and well - by visualizing the inner graph of your Git
  repositories".
 
+*[Pachyderm](https://www.pachyderm.io/open_source.html) is designed
+ to enable sustainable data science workflows via a language-agnostic
+ system for *data versioning* with data pipelining. Similar tools,
+ namely [DVC](https://dvc.org) (Data Version Control)
+ and [Meltano](https://gitlab.com/meltano/meltano) were described
+ in [Git Rev News Edition #42](https://git.github.io/rev_news/2018/08/22/edition-42/).
+
+*[git ready](http://gitready.com/): learn git one commit at a time;
+ tips are split into beginner, intermediate and advanced.
+ Latest tip is from 2015, though.
+
+
 ## Credits
 
 This edition of Git Rev News was curated by