Update README.markdown: Added upgrade instructions

README.markdown

@@ -14,6 +14,7 @@ It currently has no abilities for analyzing recorded data or opening previously
 	    2.  [Old Homebrew Instructions](#old-homebrew-instructions)
     1.  [Linux](#linux)
     2.  [Windows](#windows)
+    3.  [Upgrading](#upgrading)
 2. [Getting Started](#Getting-Started)
 
 # Introduction
@@ -40,10 +41,12 @@ dstat-interface has moved to gtk+3 and we now recommend Anaconda/Miniconda for i
 #### Old Homebrew Instructions
 The easiest way to get most of the necessary requirements to run dstat-interface is using [Homebrew](http://brew.sh):
 
-    brew tap homebrew/python
-    brew update
-    brew install python gobject-introspection gtk+3 pygobject3 py2cairo scipy zeromq 
-    brew install matplotlib --with-pygtk
+```shell
+brew tap homebrew/python
+brew update
+brew install python gobject-introspection gtk+3 pygobject3 py2cairo scipy zeromq 
+brew install matplotlib --with-pygtk
+```
 
 Be patient on the last step—matplotlib needs to be compiled and may take 2 or 3 minutes.
 
@@ -58,22 +61,24 @@ Linux prerequisite installation is similar to that of MacOS with Homebrew, only
 
 These instructions were tested on Ubuntu 17.04:
 
-````
+````shell
 sudo apt-get install gobject-introspection python-gobject python-pip
 pip install dstat-interface
 ````
 
 You will need to add your user to the `dialout` group to access virtual serial ports (replace <user> with your username):
 
-    sudo usermod -a -G dialout <user>
+```shell
+sudo usermod -a -G dialout <user>
+```
 
 ## Windows
 The following terminal commands will result in a full installation of dstat-interface and its requirements, assuming [64-bit Miniconda][1] is installed:
 
-````
+```shell
 conda create -n dstat -c mdryden python=2 dstat-interface
 activate dstat
-````
+```
 
 To finish the installation, GTK+3 and its Python bindings must be installed:
 
@@ -91,12 +96,35 @@ and `deactivate` will return to the root environment.
 
 Therefore, to run dstat-interface from our environment, we must first activate it (if not already done) before launching it:
 
-    activate dstat
-    python -m dstat_interface.main
+```shell
+activate dstat
+python -m dstat_interface.main
+```
 
 [1]: https://repo.continuum.io/miniconda/Miniconda2-latest-Windows-x86_64.exe
 [2]: https://sourceforge.net/projects/pygobjectwin32/
 
+## Upgrading
+
+Anaconda builds can be upgraded to the latest version by issuing this command (from an activated conda environment):
+
+```shell
+conda upgrade -c mdryden dstat-interface  # For MacOS, be sure to upgrade dstat-interface-deps as well
+```
+
+pip installs can be upgraded similarly:
+
+```shell
+pip install --upgrade dstat-interface
+```
+
+You can also run development builds directly from a cloned git repository (from an activated conda environment):
+
+```shell
+cd ~/src/dstat-interface/dstat_interface # Replace with path to dstat_interface folder inside repository
+python -m main
+```
+
 # Getting started
 ## Interface overview