Merge branch 'master' into v2

Merge branch 'master' into v2

update go mod to v2

Merge pull request r3labs#40 from kyenos/patch

Patch / Merge

Merge pull request r3labs#38 from alexflint/master

add filtering of struct fields

Merge pull request r3labs#38 from alexflint/master

add filtering of struct fields

Merge pull request r3labs#34 from r3labs/reset-state

reset internal state on each call to Diff()

Merge pull request r3labs#32 from r3labs/custom-diff-tag

Custom diff tag

fix go mod file

Merge pull request r3labs#28 from r3labs/fix-ci

fix ci config