Don't spellcheck requirementfiles

As some python module names are not proper english words

Signed-off-by: Bas Zoetekouw <bas.zoetekouw@surf.nl>

.codespellrc

@@ -1,4 +1,4 @@
 [codespell]
-skip = .git,*.pdf,*.svg
+skip = .git,*.pdf,*.svg,requirements.txt,test-requirements.txt
 # poped - loved variable name
 ignore-words-list = poped