LICENSE was introduced in EUMM 6.30_01

According to the ExtUtils::MakeMaker changelog, support for the
LICENSE field was introduced in 6.30_01, but Dancer was only
adding this field for versions 6.30_02 and above.

script/dancer

@@ -328,7 +328,7 @@ WriteMakefile(
     AUTHOR              => q{YOUR NAME <youremail\@example.com>},
     VERSION_FROM        => 'lib/$appfile.pm',
     ABSTRACT            => 'YOUR APPLICATION ABSTRACT',
-    (\$ExtUtils::MakeMaker::VERSION >= 6.3002
+    (\$ExtUtils::MakeMaker::VERSION >= 6.3001
       ? ('LICENSE'=> 'perl')
       : ()),
     PL_FILES            => {},