installation notes in the README

README

@@ -1,30 +1,35 @@
                                   when-changed
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                       Run a command when a file is changed
 
 
     ~ What is it?
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       Tired of switching to the shell to test the changes you just made to
       your code? Starting to feel like a mindless drone, manually running
       pdflatex for the 30th time to see how your resume now looks?
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       Worry not, when-changed is here to help! Whenever it sees that you have
       changed the file, when-changed runs any command you specify.
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       So to generate your latex resume automatically, you can do this:
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       $ when-changed CV.tex pdflatex CV.tex
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       Sweetness!
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+
     ~ What do I need?
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       Python 2.6+
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+    ~ Installation
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+      pip install https://github.com/joh/when-changed/archive/master.zip
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+
     ~ Usage
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       when-changed FILE COMMAND...
       when-changed FILE [FILE ...] -c COMMAND