Uppercase every type of commit to avoid control words like Feat

[sergiotejon]

If we convert to uppercase we won't need to check everything like following:

var bcPrefix = []string{
	"BREAKING CHANGE:", "BREAKING CHANGE(",
	"breaking change:", "breaking change(",
	"Breaking change:", "Breaking change(",
	"bc:", "bc(",
	"BC:", "BC(",
	"Bc:", "Bc(",
}
var featPrefix = []string{
	"feat:", "feat(",
	"Feat:", "Feat(",
	"feature:", "feature(",
	"Feature:", "Feature(",
	"FEAT:", "FEAT(",
}
var fixPrefix = []string{
	"fix:", "fix(",
	"Fix:", "Fix(",
	"FIX:", "FIX(",
	"bug:", "bug(",
	"Bug:", "Bug(",
	"BUG:", "BUG(",
	"bugfix:", "bugfix(",
	"Bugfix:", "Bugfix(",
	"BUGFIX:", "BUGFIX(",
}
var refactorPrefix = []string{
	"refactor:", "refactor(",
	"Refactor:", "Refactor(",
	"REFACTOR:", "REFACTOR(",
}```