Getting-Started-with-MMGen: add section "Keeping your installation up to date"

Getting-Started-with-MMGen.md

@@ -26,6 +26,7 @@
 * [BIP 125 replace-by-fee (RBF) transactions](#a_rbf)
 	* [With an online (hot) wallet](#a_rbf_onl)
 	* [With an offline (cold storage) wallet](#a_rbf_onf)
+* [Keeping your installation up to date](#a_utd)
 
 ### <a name='a_i'>Preliminaries</a>
 
@@ -868,6 +869,42 @@ them in turn until you get a confirmation:
 	$ mmgen-txsend 124FFF[0.1,150].sigtx  # ...if this doesn’t confirm, then
 	$ mmgen-txsend 73DABB[0.1,200].sigtx
 
+#### <a name='a_utd'>Keeping your installation up to date</a>
+
+To make sure you have all the latest features and bugfixes, it’s a good idea to
+keep your MMGen installation upgraded to the latest version.  MMGen does no
+checking for updates itself, so the following steps should be performed by you
+on a periodic basis.
+
+If you’ve deleted or lost your local copy of the MMGen repository, clone it
+again from Github or Gitlab:
+
+	$ git clone https://github.com/mmgen/mmgen.git # Github
+	$ git clone https://gitlab.com/mmgen/mmgen.git # Gitlab
+
+Enter the repository and check out the master branch.  Pull the latest changes
+from the remote repository:
+
+	$ cd mmgen
+	$ git checkout master
+	$ git pull
+
+Check out the current stable version for your operating system:
+
+	$ git checkout stable_linux # for Linux-based systems
+	$ git checkout stable_msys2 # for Microsoft Windows / MSYS2 systems
+
+Note that if you want to try out the latest “bleeding edge” (and possibly
+unstable) features, you can just remain on the master branch and omit the
+preceding step.  Information on recently added features can be found by typing
+`git log` or visiting the commits page on [Github][hc] or [Gitlab][lc].
+
+Check the latest release notes in `doc/release-notes` and make note of any new
+features or requirements.  Now perform the install:
+
+	$ sudo ./setup.py install # Linux
+	$ ./setup.py install      # Windows / MSYS2
+
 [01]: Tracking-and-spending-ordinary-Bitcoin-addresses
 [02]: https://tpfaucet.appspot.com
 [03]: Recovering-Your-Keys-Without-the-MMGen-Software
@@ -875,4 +912,5 @@ them in turn until you get a confirmation:
 [05]: Key-address-files
 [06]: Subwallets
 [07]: autosign-[MMGen-command-help]
-
+[hc]: https://github.com/mmgen/mmgen/commits/master
+[lc]: https://gitlab.com/mmgen/mmgen/commits/master