Adds full stop to README.md

[heyhaleema]

This PR adds a full stop to Line 178 in README.md.

[heyhaleema]

Quoting comment from #232 regarding SNR test assertion failure in PR checks for visibility:

I think the issue is Ubuntu, particularly numpy* in that OS vs. macOS:

• Potentially! See this and this post.

[github-actions[bot]]

Coverage Report

File	Stmts	Miss	Cover	Missing
hazenlib
init.py	136	34	75%	137, 141, 151, 156, 193, 200–205, 216, 219–226, 246–248, 266–268, 287–289, 298, 303, 309, 339, 373–374
acr_uniformity.py	92	39	58%	91–107, 114–143, 147
ghosting.py	151	55	64%	24, 89–90, 94, 104–105, 133–135, 151–153, 215–248, 255–275, 280
relaxometry.py	317	90	72%	238–256, 630, 689–691, 745, 793–815, 833–848, 1173–1176, 1185–1188, 1200–1213, 1216–1221, 1233–1263
slice_position.py	110	20	82%	73–74, 99, 183, 190–203, 211, 219–220, 231
slice_width.py	378	61	84%	28, 31, 39–44, 47, 115, 173–191, 466, 471–472, 478, 483, 546–547, 782–821, 857–860, 863–866
snr.py	165	47	72%	42–47, 209–219, 262–266, 304–315, 321–329, 357–368, 392, 400–402, 405
snr_map.py	108	5	95%	403, 408–410, 440
spatial_resolution.py	293	91	69%	44–102, 116, 208, 248–255, 283, 416–449, 481–484, 488–491
tools.py	75	6	92%	43–50, 89
uniformity.py	79	22	72%	69–70, 77, 111–123, 135–137, 140, 144–147, 155
TOTAL	1940	470	76%

Tests	Skipped	Failures	Errors	Time
178	0 :zzz:	0 :x:	0 :fire:	2m 20s :stopwatch:

[tomaroberts]

Closing PR as GH Actions tests now passing.