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README: Add `Pitfalls` section #172

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Job	Run time
Coding standards	8s
Test compiling command (7.1)	20s
Test compiling command (7.2)	19s
Test compiling command (7.3)	15s
Test compiling command (7.4)	19s
Test compiling command (8)	25s
Test compiling command (8.1)	14s
Test compiling command (8.2)	24s
Test compiling command (8.3)	13s
	2m 37s