Vyprvpn support, fix #181 (#193)

internal/params/vypervpn.go

@@ -0,0 +1,11 @@
+package params
+
+import (
+	"github.com/qdm12/private-internet-access-docker/internal/constants"
+)
+
+// GetVyprvpnRegion obtains the region for the Vyprvpn server from the
+// environment variable REGION
+func (r *reader) GetVyprvpnRegion() (region string, err error) {
+	return r.envParams.GetValueIfInside("REGION", constants.VyprvpnRegionChoices())
+}