feat: add MRU, SLE, STN currency support (#143)

* feat: add MRU, SLE, STN currency support

* update the Sierra Leone currency numeric code

constants.go

@@ -102,6 +102,7 @@ const (
 	MNT = "MNT"
 	MOP = "MOP"
 	MUR = "MUR"
+	MRU = "MRU"
 	MVR = "MVR"
 	MWK = "MWK"
 	MXN = "MXN"
@@ -135,11 +136,13 @@ const (
 	SGD = "SGD"
 	SHP = "SHP"
 	SKK = "SKK"
+	SLE = "SLE"
 	SLL = "SLL"
 	SOS = "SOS"
 	SRD = "SRD"
 	SSP = "SSP"
 	STD = "STD"
+	STN = "STN"
 	SVC = "SVC"
 	SYP = "SYP"
 	SZL = "SZL"

currency.go

@@ -145,6 +145,7 @@ var currencies = Currencies{
 	MMK: {Decimal: ".", Thousand: ",", Code: MMK, Fraction: 2, NumericCode: "104", Grapheme: "K", Template: "$1"},
 	MNT: {Decimal: ".", Thousand: ",", Code: MNT, Fraction: 2, NumericCode: "496", Grapheme: "\u20ae", Template: "$1"},
 	MOP: {Decimal: ".", Thousand: ",", Code: MOP, Fraction: 2, NumericCode: "446", Grapheme: "P", Template: "1 $"},
+	MRU: {Decimal: ".", Thousand: ",", Code: MRU, Fraction: 2, NumericCode: "929", Grapheme: "UM", Template: "$1"},
 	MUR: {Decimal: ".", Thousand: ",", Code: MUR, Fraction: 2, NumericCode: "480", Grapheme: "\u20a8", Template: "$1"},
 	MVR: {Decimal: ".", Thousand: ",", Code: MVR, Fraction: 2, NumericCode: "462", Grapheme: "MVR", Template: "1 $"},
 	MWK: {Decimal: ".", Thousand: ",", Code: MWK, Fraction: 2, NumericCode: "454", Grapheme: "MK", Template: "$1"},
@@ -179,11 +180,13 @@ var currencies = Currencies{
 	SGD: {Decimal: ".", Thousand: ",", Code: SGD, Fraction: 2, NumericCode: "702", Grapheme: "$", Template: "$1"},
 	SHP: {Decimal: ".", Thousand: ",", Code: SHP, Fraction: 2, NumericCode: "654", Grapheme: "\u00a3", Template: "$1"},
 	SKK: {Decimal: ".", Thousand: ",", Code: SKK, Fraction: 2, NumericCode: "", Grapheme: "Sk", Template: "$1"},
+	SLE: {Decimal: ".", Thousand: ",", Code: SLE, Fraction: 2, NumericCode: "925", Grapheme: "Le", Template: "1 $"},
 	SLL: {Decimal: ".", Thousand: ",", Code: SLL, Fraction: 2, NumericCode: "694", Grapheme: "Le", Template: "1 $"},
 	SOS: {Decimal: ".", Thousand: ",", Code: SOS, Fraction: 2, NumericCode: "706", Grapheme: "Sh", Template: "1 $"},
 	SRD: {Decimal: ".", Thousand: ",", Code: SRD, Fraction: 2, NumericCode: "968", Grapheme: "$", Template: "$1"},
 	SSP: {Decimal: ".", Thousand: ",", Code: SSP, Fraction: 2, NumericCode: "728", Grapheme: "\u00a3", Template: "1 $"},
 	STD: {Decimal: ".", Thousand: ",", Code: STD, Fraction: 2, NumericCode: "", Grapheme: "Db", Template: "1 $"},
+	STN: {Decimal: ".", Thousand: ",", Code: STN, Fraction: 2, NumericCode: "930", Grapheme: "Db", Template: "1 $"},
 	SVC: {Decimal: ".", Thousand: ",", Code: SVC, Fraction: 2, NumericCode: "222", Grapheme: "\u20a1", Template: "$1"},
 	SYP: {Decimal: ".", Thousand: ",", Code: SYP, Fraction: 2, NumericCode: "760", Grapheme: "\u00a3", Template: "1 $"},
 	SZL: {Decimal: ".", Thousand: ",", Code: SZL, Fraction: 2, NumericCode: "748", Grapheme: "\u00a3", Template: "$1"},