v1.4.2

Changelog

cf32784 Concurrency blocking issue (#171)
6e96948 Merge pull request #167 from scylladb/driver_upgrade
e04d4f9 Merge pull request #170 from scylladb/penberg/fix-zero-warmup
87fdbdf gemini: Fix indefinite hang if warmup is set to zero
0b52647 gemini: bumped gocql version to 1.2.1
2541271 gemini: changelog for 1.4.2
ccde4ec gemini: ensures that full source doesn't block
05b3757 gemini: generator no longer blocks on starved old values
c1916a6 gemini: generator no longer blocks on starved old values (#172)
853fbe1 gemini: sources has prometheus gauges
e2e551c schema: sources non-blocking changelog