fix: Avoid return within a block (Ruby 2.5)

Author: kgilpin

lib/appmap/hook.rb

@@ -116,7 +116,7 @@ def hook_builtins
 
               hook_method = lambda do |entry|
                 cls, method = entry
-                return false if config.never_hook?(cls, method)
+                next if config.never_hook?(cls, method)
 
                 hook.package.handler_class.new(hook.package, cls, method).activate
               end

lib/appmap/open.rb

@@ -38,7 +38,7 @@ def run_server
       Thread.new do
         Rack::Handler::WEBrick.run(
           lambda do |env|
-            return [200, { 'Content-Type' => 'text/html' }, [page]]
+            [200, { 'Content-Type' => 'text/html' }, [page]]
           end,
           :Port => 0
         ) do |server|