add PostgreSQLBoolLiteral

Author: tanner0101

Sources/PostgreSQL/SQL/PostgreSQLBoolLiteral.swift

@@ -0,0 +1,22 @@
+public enum PostgreSQLBoolLiteral: SQLBoolLiteral {
+    /// See `SQLBoolLiteral`.
+    public static var `true`: PostgreSQLBoolLiteral {
+        return ._true
+    }
+    
+    /// See `SQLBoolLiteral`.
+    public static var `false`: PostgreSQLBoolLiteral {
+        return ._false
+    }
+    
+    case _true
+    case _false
+    
+    /// See `SQLSerializable`.
+    public func serialize(_ binds: inout [Encodable]) -> String {
+        switch self {
+        case ._true: return "TRUE"
+        case ._false: return "FALSE"
+        }
+    }
+}

Sources/PostgreSQL/SQL/PostgreSQLGeneric.swift

@@ -73,7 +73,7 @@ public typealias PostgreSQLJoin = GenericSQLJoin<
 public typealias PostgreSQLJoinMethod = GenericSQLJoinMethod
 
 /// See `SQLQuery`.
-public typealias PostgreSQLLiteral = GenericSQLLiteral<PostgreSQLDefaultLiteral>
+public typealias PostgreSQLLiteral = GenericSQLLiteral<PostgreSQLDefaultLiteral, PostgreSQLBoolLiteral>
 
 /// See `SQLQuery`.
 public typealias PostgreSQLOrderBy = GenericSQLOrderBy<PostgreSQLExpression, PostgreSQLDirection>