Warp long line 72 to placate rumdl in pre-commit

CONTRIBUTING.md:72:351: [MD013] Line length 376 exceeds 350 characters

Author: cclauss

CONTRIBUTING.md

@@ -69,7 +69,8 @@ Algorithms should:
 - contain doctests that test both valid and erroneous input values,
 - return all calculation results instead of printing or plotting them.
 
-Algorithms in this repo should not be simple how-to examples for existing Python packages. Instead, they should perform internal calculations or manipulations to convert input values into different output values. These calculations or manipulations can use data types, classes, or functions of existing Python packages, but each algorithm in this repo should add unique value.
+Algorithms in this repo should not be simple how-to examples for existing Python packages. Instead, they should perform internal calculations or manipulations to convert input values into different output values.
+These calculations or manipulations can use data types, classes, or functions of existing Python packages, but each algorithm in this repo should add unique value.
 
 #### Pre-Commit Plugin