[vpython] Fix PEP425 naming.

vpython/api/vpython/pep425.proto

Index: vpython/api/vpython/pep425.proto
diff --git a/vpython/api/vpython/pep425.proto b/vpython/api/vpython/pep425.proto
index 803b4565e45522ac3c4f4d9349fa017fb6c04477..2ef969efd7622be83febf93d3512e0993abf149d 100644
--- a/vpython/api/vpython/pep425.proto
+++ b/vpython/api/vpython/pep425.proto
@@ -7,12 +7,12 @@ syntax = "proto3";
 package vpython;
 
 // Represnets a Python PEP425 tag.

[qyearsley, 2017/06/06 14:33:32]

Unrelated typo on this line.

[dnj, 2017/06/06 19:34:49]

Done.

-message Pep425Tag {
-  // Version is the PEP425 version tag (e.g., "cp27").
-  string version  = 1;
-  // ABI is the PEP425 ABI tag (e.g., "cp27mu", "none").
+message PEP425Tag {
+  // Version is the PEP425 python tag (e.g., "cp27").

[qyearsley, 2017/06/06 14:33:32]

This comment should be updated too.

[dnj, 2017/06/06 19:34:50]

Done.

+  string python  = 1;
+  // ABI is the PEP425 "python ABI" tag (e.g., "cp27mu", "none").
   string abi = 2;
-  // Arch is the PEP425 architecture tag (e.g., "linux_x86_64", "armv7l",
-  // "any").
-  string arch = 3;
+  // Platform is the PEP425 "python platform" tag (e.g., "linux_x86_64",
+  // "armv7l", "any").
+  string platform = 3;
 }