revert back to v1 in the go mods

fixes #137

Author: jfeliu007

cmd/goplantuml/main.go

@@ -4,7 +4,7 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	goplantuml "github.com/jfeliu007/goplantuml/v2/parser"
+	goplantuml "github.com/jfeliu007/goplantuml/parser"
 	"io"
 	"os"
 	"path/filepath"

go.mod

@@ -1,7 +1,8 @@
-module github.com/jfeliu007/goplantuml/v2
+module github.com/jfeliu007/goplantuml
 
 go 1.17
 
-require github.com/spf13/afero v1.8.2
-
-require golang.org/x/text v0.3.7 // indirect
+require (
+	github.com/spf13/afero v1.8.2
+	golang.org/x/text v0.3.7 // indirect
+)