Added all required dependencies

vendor/github.com/mcuadros/go-version/constraint.go

@@ -0,0 +1,49 @@
+package version
+
+import (
+	"strings"
+)
+
+type Constraint struct {
+	operator string
+	version  string
+}
+
+// Return a new Constrain and sets operator and version to compare
+func NewConstrain(operator, version string) *Constraint {
+	constraint := new(Constraint)
+	constraint.SetOperator(operator)
+	constraint.SetVersion(version)
+
+	return constraint
+}
+
+// Sets operator to compare
+func (self *Constraint) SetOperator(operator string) {
+	self.operator = operator
+}
+
+// Get operator to compare
+func (self *Constraint) GetOperator() string {
+	return self.operator
+}
+
+// Sets version to compare
+func (self *Constraint) SetVersion(version string) {
+	self.version = version
+}
+
+// Get version to compare
+func (self *Constraint) GetVersion() string {
+	return self.version
+}
+
+// Match a given version againts the constraint
+func (self *Constraint) Match(version string) bool {
+	return Compare(version, self.version, self.operator)
+}
+
+// Return a string representation
+func (self *Constraint) String() string {
+	return strings.Trim(self.operator+" "+self.version, " ")
+}