use jsonb instead of json (#131)

Author: tanner0101

Sources/FluentPostgresDriver/PostgresConverterDelegate.swift

@@ -13,6 +13,8 @@ struct PostgresConverterDelegate: SQLConverterDelegate {
             return SQLRaw("TIMESTAMPTZ")
         case .double:
             return SQLRaw("DOUBLE PRECISION")
+        case .json:
+            return SQLRaw("JSONB")
         default:
             return nil
         }

Tests/FluentPostgresDriverTests/FluentPostgresDriverTests.swift

@@ -255,6 +255,7 @@ final class FluentPostgresDriverTests: XCTestCase {
             }
         }
 
+        try? EventMigration().revert(on: self.db).wait()
         try EventMigration().prepare(on: self.db).wait()
         defer { try! EventMigration().revert(on: self.db).wait() }