Merge pull request #2343 from JCount/gpg-requirement-add-2.1-series

gpg: add GnuPG series 2.1.x to supported versions

Library/Homebrew/gpg.rb

@@ -5,7 +5,9 @@ class Gpg
     which_all(executable).detect do |gpg|
       gpg_short_version = Utils.popen_read(gpg, "--version")[/\d\.\d/, 0]
       next unless gpg_short_version
-      Version.create(gpg_short_version.to_s) == Version.create("2.0")
+      gpg_version = Version.create(gpg_short_version.to_s)
+      gpg_version == Version.create("2.0") ||
+        gpg_version == Version.create("2.1")
     end
   end
 

Library/Homebrew/requirements/gpg2_requirement.rb

@@ -3,10 +3,10 @@ require "gpg"
 
 class GPG2Requirement < Requirement
   fatal true
-  default_formula "gnupg2"
+  default_formula "gnupg"
 
   # MacGPG2/GPGTools installs GnuPG 2.0.x as a vanilla `gpg` symlink
   # pointing to `gpg2`, as do we. Ensure we're actually using a 2.0 `gpg`.
-  # Temporarily, only support 2.0.x rather than the 2.1.x "modern" series.
+  # Support both the 2.0.x "stable" and 2.1.x "modern" series.
   satisfy(build_env: false) { Gpg.gpg2 || Gpg.gpg }
 end