typo fix [skip ci]

README.md

@@ -188,8 +188,8 @@ For testing `pymagglobal`, we use `pyfield` and `orthopoly`
 FieldTools - A toolbox for manipulating vector fields on the sphere  
 GFZ Data Services. 10.5880/fidgeo.2019.033
 
-[\[orthopoly\]](https://wordsworthgroup.github.io/orthopoly/index.html) Mark Baum (2020).  
- wordsworthgroup/orthopoly v0.7 (Version v0.7).  
+[\[orthopoly\]](https://wordsworthgroup.github.io/orthopoly/index.html) Mark Baum (2020)  
+ wordsworthgroup/orthopoly v0.7 (Version v0.7)  
 Zenodo. http://doi.org/10.5281/zenodo.3779456
 
 ## License