Fixed typos

README.md

-# MiBIG SMILES
+# MIBiG SMILES
 
 ## mibig_smiles.py
 
-This script reads the dump file with all the entries of the MiBIG repository and
+This script reads the dump file with all the entries of the MIBiG repository and
 tries to retrieve all the SMILES strings (which store the chemical structure of the compound).
 
 The dump can be downloaded [here](http://mibig.secondarymetabolites.org/download.html),