getTagName function uses strings.TrimLeft instead of TrimPrefix

[GrosQuildu]

Describe the bug

In the code below the "name=" string is a cutset (a set of characters) to be removed, and not a prefix.

revive/rule/struct-tag.go

Lines 139 to 140 in b03e54f

	if strings.HasPrefix(option, "name=") {
	return strings.TrimLeft(option, "name=")

getTagName function will return o instead of ameno for the this struct tag: protobuf:"varint,name=ameno".

[mgechev]

Thanks for pointing this out! Should be fixed by #827.