xcode: expect 7.3.1 on 10.11

Library/Homebrew/os/mac.rb

@@ -296,6 +296,7 @@ module OS
       "7.2"   => { :clang => "7.0", :clang_build => 700 },
       "7.2.1" => { :clang => "7.0", :clang_build => 700 },
       "7.3"   => { :clang => "7.3", :clang_build => 703 },
+      "7.3.1" => { :clang => "7.3", :clang_build => 703 },
     }
 
     def compilers_standard?

Library/Homebrew/os/mac/xcode.rb

@@ -15,11 +15,11 @@ module OS
         when "10.8"  then "5.1.1"
         when "10.9"  then "6.2"
         when "10.10" then "7.2.1"
-        when "10.11" then "7.3"
+        when "10.11" then "7.3.1"
         else
           # Default to newest known version of Xcode for unreleased OSX versions.
           if OS::Mac.prerelease?
-            "7.3"
+            "7.3.1"
           else
             raise "OS X '#{MacOS.version}' is invalid"
           end
@@ -172,7 +172,7 @@ module OS
 
       def latest_version
         case MacOS.version
-        when "10.11" then "703.0.29"
+        when "10.11" then "703.0.31"
         when "10.10" then "700.1.81"
         when "10.9"  then "600.0.57"
         when "10.8"  then "503.0.40"

share/doc/homebrew/Xcode.md

@@ -10,7 +10,7 @@ Tools available for your platform:
  10.8  | 5.1.1 | April 2014
  10.9  | 6.2   | 6.2
  10.10 | 7.2.1 | 7.2
- 10.11 | 7.3   | 7.3
+ 10.11 | 7.3.1 | 7.3
 
 
 ## Compiler Version Database
@@ -63,6 +63,7 @@ Tools available for your platform:
  7.2       | —           | —           | —                | —           | 7.0 (700.1.81)  | -
  7.2.1     | —           | —           | —                | —           | 7.0 (700.1.81)  | -
  7.3       | —           | —           | —                | —           | 7.3 (703.0.29)  | -
+ 7.3.1     | —           | —           | —                | —           | 7.3 (703.0.31)  | -
 
 ## References to Xcode and compiler versions in code
 When a new Xcode release is made, the following things need to be