feat: update stdlib mapping for go1.15

- drop stdlib for go1.13
- generate stdlib for go1.15
-  update CI configuration.

stdlib/go1_15_crypto_rsa.go

@@ -0,0 +1,43 @@
+// Code generated by 'github.com/containous/yaegi/extract crypto/rsa'. DO NOT EDIT.
+
+// +build go1.15,!go1.16
+
+package stdlib
+
+import (
+	"crypto/rsa"
+	"go/constant"
+	"go/token"
+	"reflect"
+)
+
+func init() {
+	Symbols["crypto/rsa"] = map[string]reflect.Value{
+		// function, constant and variable definitions
+		"DecryptOAEP":               reflect.ValueOf(rsa.DecryptOAEP),
+		"DecryptPKCS1v15":           reflect.ValueOf(rsa.DecryptPKCS1v15),
+		"DecryptPKCS1v15SessionKey": reflect.ValueOf(rsa.DecryptPKCS1v15SessionKey),
+		"EncryptOAEP":               reflect.ValueOf(rsa.EncryptOAEP),
+		"EncryptPKCS1v15":           reflect.ValueOf(rsa.EncryptPKCS1v15),
+		"ErrDecryption":             reflect.ValueOf(&rsa.ErrDecryption).Elem(),
+		"ErrMessageTooLong":         reflect.ValueOf(&rsa.ErrMessageTooLong).Elem(),
+		"ErrVerification":           reflect.ValueOf(&rsa.ErrVerification).Elem(),
+		"GenerateKey":               reflect.ValueOf(rsa.GenerateKey),
+		"GenerateMultiPrimeKey":     reflect.ValueOf(rsa.GenerateMultiPrimeKey),
+		"PSSSaltLengthAuto":         reflect.ValueOf(constant.MakeFromLiteral("0", token.INT, 0)),
+		"PSSSaltLengthEqualsHash":   reflect.ValueOf(constant.MakeFromLiteral("-1", token.INT, 0)),
+		"SignPKCS1v15":              reflect.ValueOf(rsa.SignPKCS1v15),
+		"SignPSS":                   reflect.ValueOf(rsa.SignPSS),
+		"VerifyPKCS1v15":            reflect.ValueOf(rsa.VerifyPKCS1v15),
+		"VerifyPSS":                 reflect.ValueOf(rsa.VerifyPSS),
+
+		// type definitions
+		"CRTValue":               reflect.ValueOf((*rsa.CRTValue)(nil)),
+		"OAEPOptions":            reflect.ValueOf((*rsa.OAEPOptions)(nil)),
+		"PKCS1v15DecryptOptions": reflect.ValueOf((*rsa.PKCS1v15DecryptOptions)(nil)),
+		"PSSOptions":             reflect.ValueOf((*rsa.PSSOptions)(nil)),
+		"PrecomputedValues":      reflect.ValueOf((*rsa.PrecomputedValues)(nil)),
+		"PrivateKey":             reflect.ValueOf((*rsa.PrivateKey)(nil)),
+		"PublicKey":              reflect.ValueOf((*rsa.PublicKey)(nil)),
+	}
+}