Update docs [CI skip]

Author: s-m-t-c

docs/history.rst

@@ -14,8 +14,6 @@ Fixed
 - Fix wrong sign in Y-intercept output file.
 - Fix and simplify how user supplied reference pixel is validated and cropping issue.
 - Add metadata for reference pixel latitude and longitude to output files.
-- Fix non-determinism in unit tests that use array comparison by running them single threaded.
-
 
 0.6.0 (2021-10-18)
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