Do not suggest match_array / contains_exactly for empty arrays

These suggestions are useful in general, but for an empty array it
doesn't really make sense: `eq([])` is both shorter and clearer.
Ordering cannot possibly be an issue with an empty array.

spec/tooling/danger/specs_spec.rb

@@ -118,7 +118,8 @@
         "- expect(foo).to match(['bar'])",
         "- expect(foo).to match ['bar']",
         "- expect(foo).to eq(['bar'])",
-        "- expect(foo).to eq ['bar']"
+        "- expect(foo).to eq ['bar']",
+        "+ expect(foo).to eq([])"
       ] + matching_lines
     end
 
@@ -126,7 +127,7 @@
       allow(specs.helper).to receive(:changed_lines).with(filename).and_return(changed_lines)
     end
 
-    it 'returns added, modified, and renamed_after files by default' do
+    it 'returns all lines using an array equality matcher' do
       expect(specs.added_line_matching_match_with_array(filename)).to match_array(matching_lines)
     end
   end

tooling/danger/specs.rb

@@ -5,7 +5,7 @@ module Danger
     module Specs
       SPEC_FILES_REGEX = 'spec/'
       EE_PREFIX = 'ee/'
-      MATCH_WITH_ARRAY_REGEX = /(?<to>to\(?\s*)(?<matcher>match|eq)(?<expectation>[( ]?\[)/.freeze
+      MATCH_WITH_ARRAY_REGEX = /(?<to>to\(?\s*)(?<matcher>match|eq)(?<expectation>[( ]?\[[^\]]+)/.freeze
       SUGGEST_MR_COMMENT = <<~SUGGEST_COMMENT
       ```suggestion
       %<suggested_line>s