Wip add comment to explain why we added the benchmark

WIP because, we have to gather benchmark output from the CI

Author: benoittgt

benchmarks/symbol_to_proc_vs_block.rb

@@ -1,3 +1,7 @@
+# We have not decided how we are going to handle the symbol to proc vs
+# block implementations. This is because the block is faster on JRuby
+# but slower on Ruby 1.9.2 through 2.2.2.
+
 require 'benchmark'
 
 RANGE = (1..100)

script/run_build

@@ -20,6 +20,9 @@ fi
 
 fold "cukes" run_cukes
 
+# To remove after benchmark measurement
+ruby benchmarks/symbol_to_proc_vs_block.rb
+
 if documentation_enforced; then
   fold "doc check" check_documentation_coverage
 fi