rm bpchar to int support, use char with quotes (vapor#73)

Author: tanner0101

Sources/PostgresNIO/Data/PostgresData+Int.swift

@@ -115,7 +115,7 @@ private extension PostgresData {
         switch self.formatCode {
         case .binary:
             switch self.type {
-            case .char, .bpchar:
+            case .char:
                 assert(value.readableBytes == 1)
                 guard let uint8 = value.getInteger(at: value.readerIndex, as: UInt8.self) else {
                     return nil

Tests/PostgresNIOTests/PostgresNIOTests.swift

@@ -986,7 +986,7 @@ final class PostgresNIOTests: XCTestCase {
         defer { try! conn.close().wait() }
         let rows = try conn.query("""
         select
-            $1::char as int
+            $1::"char" as int
         """, [
             .init(uint8: 5)
         ]).wait()