Install GeoTrust root for certvalidator tests on AppVeyor
diff --git a/appveyor.yml b/appveyor.yml
index 9108c9a..11f17d7 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -44,6 +44,61 @@
         New-Item -ItemType directory -Path "$env:PYTMP" | Out-Null;
       }
 
+      [Byte[]] $geotrustCaBytes = 0x30,0x82,0x03,0x7C,0x30,0x82,0x02,0x64,0xA0,0x03,0x02,0x01,0x02,
+      0x02,0x10,0x18,0xAC,0xB5,0x6A,0xFD,0x69,0xB6,0x15,0x3A,0x63,0x6C,0xAF,0xDA,0xFA,0xC4,0xA1,0x30,
+      0x0D,0x06,0x09,0x2A,0x86,0x48,0x86,0xF7,0x0D,0x01,0x01,0x05,0x05,0x00,0x30,0x58,0x31,0x0B,0x30,
+      0x09,0x06,0x03,0x55,0x04,0x06,0x13,0x02,0x55,0x53,0x31,0x16,0x30,0x14,0x06,0x03,0x55,0x04,0x0A,
+      0x13,0x0D,0x47,0x65,0x6F,0x54,0x72,0x75,0x73,0x74,0x20,0x49,0x6E,0x63,0x2E,0x31,0x31,0x30,0x2F,
+      0x06,0x03,0x55,0x04,0x03,0x13,0x28,0x47,0x65,0x6F,0x54,0x72,0x75,0x73,0x74,0x20,0x50,0x72,0x69,
+      0x6D,0x61,0x72,0x79,0x20,0x43,0x65,0x72,0x74,0x69,0x66,0x69,0x63,0x61,0x74,0x69,0x6F,0x6E,0x20,
+      0x41,0x75,0x74,0x68,0x6F,0x72,0x69,0x74,0x79,0x30,0x1E,0x17,0x0D,0x30,0x36,0x31,0x31,0x32,0x37,
+      0x30,0x30,0x30,0x30,0x30,0x30,0x5A,0x17,0x0D,0x33,0x36,0x30,0x37,0x31,0x36,0x32,0x33,0x35,0x39,
+      0x35,0x39,0x5A,0x30,0x58,0x31,0x0B,0x30,0x09,0x06,0x03,0x55,0x04,0x06,0x13,0x02,0x55,0x53,0x31,
+      0x16,0x30,0x14,0x06,0x03,0x55,0x04,0x0A,0x13,0x0D,0x47,0x65,0x6F,0x54,0x72,0x75,0x73,0x74,0x20,
+      0x49,0x6E,0x63,0x2E,0x31,0x31,0x30,0x2F,0x06,0x03,0x55,0x04,0x03,0x13,0x28,0x47,0x65,0x6F,0x54,
+      0x72,0x75,0x73,0x74,0x20,0x50,0x72,0x69,0x6D,0x61,0x72,0x79,0x20,0x43,0x65,0x72,0x74,0x69,0x66,
+      0x69,0x63,0x61,0x74,0x69,0x6F,0x6E,0x20,0x41,0x75,0x74,0x68,0x6F,0x72,0x69,0x74,0x79,0x30,0x82,
+      0x01,0x22,0x30,0x0D,0x06,0x09,0x2A,0x86,0x48,0x86,0xF7,0x0D,0x01,0x01,0x01,0x05,0x00,0x03,0x82,
+      0x01,0x0F,0x00,0x30,0x82,0x01,0x0A,0x02,0x82,0x01,0x01,0x00,0xBE,0xB8,0x15,0x7B,0xFF,0xD4,0x7C,
+      0x7D,0x67,0xAD,0x83,0x64,0x7B,0xC8,0x42,0x53,0x2D,0xDF,0xF6,0x84,0x08,0x20,0x61,0xD6,0x01,0x59,
+      0x6A,0x9C,0x44,0x11,0xAF,0xEF,0x76,0xFD,0x95,0x7E,0xCE,0x61,0x30,0xBB,0x7A,0x83,0x5F,0x02,0xBD,
+      0x01,0x66,0xCA,0xEE,0x15,0x8D,0x6F,0xA1,0x30,0x9C,0xBD,0xA1,0x85,0x9E,0x94,0x3A,0xF3,0x56,0x88,
+      0x00,0x31,0xCF,0xD8,0xEE,0x6A,0x96,0x02,0xD9,0xED,0x03,0x8C,0xFB,0x75,0x6D,0xE7,0xEA,0xB8,0x55,
+      0x16,0x05,0x16,0x9A,0xF4,0xE0,0x5E,0xB1,0x88,0xC0,0x64,0x85,0x5C,0x15,0x4D,0x88,0xC7,0xB7,0xBA,
+      0xE0,0x75,0xE9,0xAD,0x05,0x3D,0x9D,0xC7,0x89,0x48,0xE0,0xBB,0x28,0xC8,0x03,0xE1,0x30,0x93,0x64,
+      0x5E,0x52,0xC0,0x59,0x70,0x22,0x35,0x57,0x88,0x8A,0xF1,0x95,0x0A,0x83,0xD7,0xBC,0x31,0x73,0x01,
+      0x34,0xED,0xEF,0x46,0x71,0xE0,0x6B,0x02,0xA8,0x35,0x72,0x6B,0x97,0x9B,0x66,0xE0,0xCB,0x1C,0x79,
+      0x5F,0xD8,0x1A,0x04,0x68,0x1E,0x47,0x02,0xE6,0x9D,0x60,0xE2,0x36,0x97,0x01,0xDF,0xCE,0x35,0x92,
+      0xDF,0xBE,0x67,0xC7,0x6D,0x77,0x59,0x3B,0x8F,0x9D,0xD6,0x90,0x15,0x94,0xBC,0x42,0x34,0x10,0xC1,
+      0x39,0xF9,0xB1,0x27,0x3E,0x7E,0xD6,0x8A,0x75,0xC5,0xB2,0xAF,0x96,0xD3,0xA2,0xDE,0x9B,0xE4,0x98,
+      0xBE,0x7D,0xE1,0xE9,0x81,0xAD,0xB6,0x6F,0xFC,0xD7,0x0E,0xDA,0xE0,0x34,0xB0,0x0D,0x1A,0x77,0xE7,
+      0xE3,0x08,0x98,0xEF,0x58,0xFA,0x9C,0x84,0xB7,0x36,0xAF,0xC2,0xDF,0xAC,0xD2,0xF4,0x10,0x06,0x70,
+      0x71,0x35,0x02,0x03,0x01,0x00,0x01,0xA3,0x42,0x30,0x40,0x30,0x0F,0x06,0x03,0x55,0x1D,0x13,0x01,
+      0x01,0xFF,0x04,0x05,0x30,0x03,0x01,0x01,0xFF,0x30,0x0E,0x06,0x03,0x55,0x1D,0x0F,0x01,0x01,0xFF,
+      0x04,0x04,0x03,0x02,0x01,0x06,0x30,0x1D,0x06,0x03,0x55,0x1D,0x0E,0x04,0x16,0x04,0x14,0x2C,0xD5,
+      0x50,0x41,0x97,0x15,0x8B,0xF0,0x8F,0x36,0x61,0x5B,0x4A,0xFB,0x6B,0xD9,0x99,0xC9,0x33,0x92,0x30,
+      0x0D,0x06,0x09,0x2A,0x86,0x48,0x86,0xF7,0x0D,0x01,0x01,0x05,0x05,0x00,0x03,0x82,0x01,0x01,0x00,
+      0x5A,0x70,0x7F,0x2C,0xDD,0xB7,0x34,0x4F,0xF5,0x86,0x51,0xA9,0x26,0xBE,0x4B,0xB8,0xAA,0xF1,0x71,
+      0x0D,0xDC,0x61,0xC7,0xA0,0xEA,0x34,0x1E,0x7A,0x77,0x0F,0x04,0x35,0xE8,0x27,0x8F,0x6C,0x90,0xBF,
+      0x91,0x16,0x24,0x46,0x3E,0x4A,0x4E,0xCE,0x2B,0x16,0xD5,0x0B,0x52,0x1D,0xFC,0x1F,0x67,0xA2,0x02,
+      0x45,0x31,0x4F,0xCE,0xF3,0xFA,0x03,0xA7,0x79,0x9D,0x53,0x6A,0xD9,0xDA,0x63,0x3A,0xF8,0x80,0xD7,
+      0xD3,0x99,0xE1,0xA5,0xE1,0xBE,0xD4,0x55,0x71,0x98,0x35,0x3A,0xBE,0x93,0xEA,0xAE,0xAD,0x42,0xB2,
+      0x90,0x6F,0xE0,0xFC,0x21,0x4D,0x35,0x63,0x33,0x89,0x49,0xD6,0x9B,0x4E,0xCA,0xC7,0xE7,0x4E,0x09,
+      0x00,0xF7,0xDA,0xC7,0xEF,0x99,0x62,0x99,0x77,0xB6,0x95,0x22,0x5E,0x8A,0xA0,0xAB,0xF4,0xB8,0x78,
+      0x98,0xCA,0x38,0x19,0x99,0xC9,0x72,0x9E,0x78,0xCD,0x4B,0xAC,0xAF,0x19,0xA0,0x73,0x12,0x2D,0xFC,
+      0xC2,0x41,0xBA,0x81,0x91,0xDA,0x16,0x5A,0x31,0xB7,0xF9,0xB4,0x71,0x80,0x12,0x48,0x99,0x72,0x73,
+      0x5A,0x59,0x53,0xC1,0x63,0x52,0x33,0xED,0xA7,0xC9,0xD2,0x39,0x02,0x70,0xFA,0xE0,0xB1,0x42,0x66,
+      0x29,0xAA,0x9B,0x51,0xED,0x30,0x54,0x22,0x14,0x5F,0xD9,0xAB,0x1D,0xC1,0xE4,0x94,0xF0,0xF8,0xF5,
+      0x2B,0xF7,0xEA,0xCA,0x78,0x46,0xD6,0xB8,0x91,0xFD,0xA6,0x0D,0x2B,0x1A,0x14,0x01,0x3E,0x80,0xF0,
+      0x42,0xA0,0x95,0x07,0x5E,0x6D,0xCD,0xCC,0x4B,0xA4,0x45,0x8D,0xAB,0x12,0xE8,0xB3,0xDE,0x5A,0xE5,
+      0xA0,0x7C,0xE8,0x0F,0x22,0x1D,0x5A,0xE9,0x59;
+      $geotrustCa = New-Object System.Security.Cryptography.X509Certificates.X509Certificate2;
+      $geotrustCa.Import($geotrustCaBytes);
+      $rootStore = Get-Item cert:\LocalMachine\Root;
+      $rootStore.Open("ReadWrite");
+      $rootStore.Add($geotrustCa);
+      $rootStore.Close();
+
       if ("${env:PYTHON_ID}" -eq "pypy") {
         if (!(Test-Path "${env:PYTMP}\pypy2-v5.3.1-win32.zip")) {
           (New-Object Net.WebClient).DownloadFile('https://bitbucket.org/pypy/pypy/downloads/pypy2-v5.3.1-win32.zip', "${env:PYTMP}\pypy2-v5.3.1-win32.zip");