fix(docs): improve the contribution guidelines #86

Job	Run time
mysql:5.7 - SSL=0 Compression=0	1m 6s
mysql:5.7 - SSL=1 Compression=0	1m 8s
mysql:5.7 - SSL=0 Compression=1	1m 5s
mysql:5.7 - SSL=1 Compression=1	1m 5s
mysql:8.0.18 - SSL=0 Compression=0	1m 3s
mysql:8.0.18 - SSL=1 Compression=0	1m 6s
mysql:8.0.18 - SSL=0 Compression=1	1m 8s
mysql:8.0.18 - SSL=1 Compression=1	1m 3s
mysql:8.0.22 - SSL=0 Compression=0	1m 5s
mysql:8.0.22 - SSL=1 Compression=0	1m 4s
mysql:8.0.22 - SSL=0 Compression=1	1m 3s
mysql:8.0.22 - SSL=1 Compression=1	1m 9s
mysql:8.0.33 - SSL=0 Compression=0	1m 6s
mysql:8.0.33 - SSL=1 Compression=0	1m 11s
mysql:8.0.33 - SSL=0 Compression=1	1m 9s
mysql:8.0.33 - SSL=1 Compression=1	1m 9s
mysql:latest - SSL=0 Compression=0	1m 10s
mysql:latest - SSL=1 Compression=0	1m 11s
mysql:latest - SSL=0 Compression=1	1m 16s
mysql:latest - SSL=1 Compression=1	1m 14s
datagrip/mysql:5.1 - SSL=0 Compression=0	24s
	22m 55s

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