VPN Unlimited support (#499)

- Fixes #420 
- Revert to docker/build-push-action@v2.4.0

internal/configuration/updater.go

@@ -8,23 +8,24 @@ import (
 )
 
 type Updater struct {
-	Period     time.Duration `json:"period"`
-	DNSAddress string        `json:"dns_address"`
-	Cyberghost bool          `json:"cyberghost"`
-	Fastestvpn bool          `json:"fastestvpn"`
-	HideMyAss  bool          `json:"hidemyass"`
-	Ivpn       bool          `json:"ivpn"`
-	Mullvad    bool          `json:"mullvad"`
-	Nordvpn    bool          `json:"nordvpn"`
-	PIA        bool          `json:"pia"`
-	Privado    bool          `json:"privado"`
-	Privatevpn bool          `json:"privatevpn"`
-	Protonvpn  bool          `json:"protonvpn"`
-	Purevpn    bool          `json:"purevpn"`
-	Surfshark  bool          `json:"surfshark"`
-	Torguard   bool          `json:"torguard"`
-	Vyprvpn    bool          `json:"vyprvpn"`
-	Windscribe bool          `json:"windscribe"`
+	Period       time.Duration `json:"period"`
+	DNSAddress   string        `json:"dns_address"`
+	Cyberghost   bool          `json:"cyberghost"`
+	Fastestvpn   bool          `json:"fastestvpn"`
+	HideMyAss    bool          `json:"hidemyass"`
+	Ivpn         bool          `json:"ivpn"`
+	Mullvad      bool          `json:"mullvad"`
+	Nordvpn      bool          `json:"nordvpn"`
+	PIA          bool          `json:"pia"`
+	Privado      bool          `json:"privado"`
+	Privatevpn   bool          `json:"privatevpn"`
+	Protonvpn    bool          `json:"protonvpn"`
+	Purevpn      bool          `json:"purevpn"`
+	Surfshark    bool          `json:"surfshark"`
+	Torguard     bool          `json:"torguard"`
+	VPNUnlimited bool          `json:"vpnunlimited"`
+	Vyprvpn      bool          `json:"vyprvpn"`
+	Windscribe   bool          `json:"windscribe"`
 	// The two below should be used in CLI mode only
 	Stdout bool `json:"-"` // in order to update constants file (maintainer side)
 	CLI    bool `json:"-"`
@@ -60,6 +61,7 @@ func (settings *Updater) read(r reader) (err error) {
 	settings.Purevpn = true
 	settings.Surfshark = true
 	settings.Torguard = true
+	settings.VPNUnlimited = true
 	settings.Vyprvpn = true
 	settings.Windscribe = true
 	settings.Stdout = false