Add ability to start from user specified hash.

This feature can be useful for repositories with already established versioning, but
having hundreds of commits which could potentially produce really weird results due
to lack of previous rules on wording.

go.mod

@@ -4,17 +4,13 @@ go 1.16
 
 require (
 	github.com/Microsoft/go-winio v0.5.0 // indirect
-	github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6 // indirect
 	github.com/fsnotify/fsnotify v1.4.9 // indirect
 	github.com/go-git/go-billy/v5 v5.3.1 // indirect
-	github.com/go-git/go-git v4.7.0+incompatible // indirect
 	github.com/go-git/go-git/v5 v5.3.0
-	github.com/json-iterator/go v1.1.9 // indirect
 	github.com/kevinburke/ssh_config v1.1.0 // indirect
 	github.com/lithammer/fuzzysearch v1.1.2
 	github.com/lukaszraczylo/zero v0.0.0-20160322155811-4a4535dd56e7
 	github.com/magiconair/properties v1.8.5 // indirect
-	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/mapstructure v1.4.1 // indirect
 	github.com/pelletier/go-toml v1.9.0 // indirect
 	github.com/sergi/go-diff v1.2.0 // indirect
@@ -22,14 +18,10 @@ require (
 	github.com/spf13/cast v1.3.1 // indirect
 	github.com/spf13/cobra v1.1.3
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/spf13/viper v1.7.1
-	github.com/stretchr/testify v1.7.0 // indirect
-	github.com/xordataexchange/crypt v0.0.3-0.20170626215501-b2862e3d0a77 // indirect
+	github.com/stretchr/testify v1.7.0
 	golang.org/x/crypto v0.0.0-20210506145944-38f3c27a63bf // indirect
 	golang.org/x/net v0.0.0-20210508051633-16afe75a6701 // indirect
 	golang.org/x/sys v0.0.0-20210507161434-a76c4d0a0096 // indirect
 	gopkg.in/ini.v1 v1.62.0 // indirect
-	gopkg.in/src-d/go-git.v4 v4.13.1 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
 )