Fix multiline basic string parsing

parser.go

@@ -493,6 +493,7 @@ func (p *parser) parseMultilineBasicString(b []byte) ([]byte, []byte, error) {
 				for ; i < len(token)-3; i++ {
 					c := token[i]
 					if !(c == '\n' || c == '\r' || c == ' ' || c == '\t') {
+						i--
 						break
 					}
 				}

unmarshaler_test.go

@@ -192,6 +192,20 @@ func TestUnmarshal(t *testing.T) {
 				}
 			},
 		},
+		{
+			desc:  "multiline basic string",
+			input: `A = """\
+					Test"""`,
+			gen: func() test {
+				type doc struct {
+					A string
+				}
+				return test{
+					target:   &doc{},
+					expected: &doc{A: "Test"},
+				}
+			},
+		},
 		{
 			desc:  "kv bool true",
 			input: `A = true`,