4.2.0

Changelog

6db8734 fix issue #112: add new functions IsEmpty and IsTimeout
49ec74b fix issue #105: improve makefile
dfcfb59 issue #105: port makes with help target
85d64c0 issue #105: fix false positive result of make test
9f666a7 issue #105: try to fix false positive result of make test
de387b2 issue #97: update README.md
118f65f issue #97: update cmd/README.md
0070464 fix issue #110: add guides
270a6b9 fix issue #106: add rate limit example
422966f fix issue #107: add patreon
f027eac fix issue #109: add complex example for bash
11fddcf fix issue #111: update cmd/readme
6ec0bb4 fix link to research branch
b8c5f94 fix issue #108: remove research from main branch
3ad77c8 add asciinema to main readme

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