Minor spelling fix

Author: arvestad

Diff for: README.md

@@ -65,7 +65,7 @@ pip install alv
 ```
 
 If you have a half-modern BioPython installed, Python v3.4 _should_ work.
-BioPython is a dependency and will only get installed automatially with `pip install alv`
+BioPython is a dependency and will only get installed automatically with `pip install alv`
 if you are using Python v3.6 or later, because BioPython was apparently not on PyPi before that.
 
 ### Install the commandline tool system-wide