Merge pull request #675 from Blizzard/update-semver

update semver.lua

src/base/semver.lua

@@ -1,5 +1,5 @@
 local semver = {
-  _VERSION     = '1.2.0',
+  _VERSION     = '1.2.1',
   _DESCRIPTION = 'semver for Lua',
   _URL         = 'https://github.com/kikito/semver.lua',
   _LICENSE     = [[
@@ -173,6 +173,9 @@ end
 -- if a and b are versions, a ^ b means "b is backwards-compatible with a"
 -- in other words, "it's safe to upgrade from a to b"
 function mt:__pow(other)
+  if self.major == 0 then
+    return self == other
+  end
   return self.major == other.major and
          self.minor <= other.minor
 end