include a hashbang for all benchmark scripts

this also makes every benchmark script executable

benchmark/capture-assign.rb

@@ -1,3 +1,4 @@
+#!/usr/bin/env ruby
 require "liquid"
 require "benchmark/ips"
 

benchmark/end-with-vs-regexp

@@ -1,3 +1,4 @@
+#!/usr/bin/env ruby
 require 'benchmark/ips'
 
 Benchmark.ips do |x|

benchmark/flat-map

@@ -1,3 +1,4 @@
+#!/usr/bin/env ruby
 require 'benchmark/ips'
 
 enum = (0..50).to_a

benchmark/hash-fetch

@@ -1,3 +1,4 @@
+#!/usr/bin/env ruby
 require 'benchmark/ips'
 
 h = {:bar => 'uco'}

benchmark/proc-call-vs-yield

@@ -1,3 +1,4 @@
+#!/usr/bin/env ruby
 require 'benchmark/ips'
 
 def fast

benchmark/sequential-assignment

@@ -1,3 +1,4 @@
+#!/usr/bin/env ruby
 require 'benchmark/ips'
 
 Benchmark.ips do |x|

benchmark/string-concat

@@ -1,3 +1,4 @@
+#!/usr/bin/env ruby
 require 'benchmark/ips'
 
 url = "http://jekyllrb.com"

benchmark/string-replacement

@@ -1,3 +1,4 @@
+#!/usr/bin/env ruby
 require 'benchmark/ips'
 
 def str

benchmark/symbol-to-proc

@@ -1,3 +1,4 @@
+#!/usr/bin/env ruby
 require 'benchmark/ips'
 
 Benchmark.ips do |x|