Version bumped to 0.3.1 #287

Job	Run time
3.7 CH=23.8.4.69	1m 2s
3.7 CH=22.5.1.2079	1m 1s
3.7 CH=19.3.5	1m 2s
3.7 CH=18.14.9	58s
3.8 CH=23.8.4.69	44s
3.8 CH=22.5.1.2079	36s
3.8 CH=19.3.5	48s
3.8 CH=18.14.9	38s
3.9 CH=23.8.4.69	43s
3.9 CH=22.5.1.2079	37s
3.9 CH=19.3.5	58s
3.9 CH=18.14.9	36s
3.10 CH=23.8.4.69	38s
3.10 CH=22.5.1.2079	36s
3.10 CH=19.3.5	32s
3.10 CH=18.14.9	39s
3.11 CH=23.8.4.69	50s
3.11 CH=22.5.1.2079	33s
3.11 CH=19.3.5	29s
3.11 CH=18.14.9	48s
3.12 CH=23.8.4.69	1m 12s
3.12 CH=22.5.1.2079	1m 5s
3.12 CH=19.3.5	1m 5s
3.12 CH=18.14.9	1m 8s
Indicate completion to coveralls.io	11s
	19m 29s

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