Re-generate Spring binstubs for updated version of Spring

Prevents output like this:

    Array values in the parameter are deprecated. Please use a String or nil.
    An Array was passed in from bin/rspec:3:in `load'

1 files changed, 6 insertions, 6 deletions

diff --git a/bin/spring b/bin/spring
index 7b45d374fcd..7fe232c3aae 100755
--- a/bin/spring
+++ b/bin/spring
@@ -4,12 +4,12 @@
 # It gets overwritten when you run the `spring binstub` command.
 
 unless defined?(Spring)
-  require "rubygems"
-  require "bundler"
+  require 'rubygems'
+  require 'bundler'
 
-  if match = Bundler.default_lockfile.read.match(/^GEM$.*?^    (?:  )*spring \((.*?)\)$.*?^$/m)
-    Gem.paths = { "GEM_PATH" => [Bundler.bundle_path.to_s, *Gem.path].uniq }
-    gem "spring", match[1]
-    require "spring/binstub"
+  if (match = Bundler.default_lockfile.read.match(/^GEM$.*?^    (?:  )*spring \((.*?)\)$.*?^$/m))
+    Gem.paths = { 'GEM_PATH' => [Bundler.bundle_path.to_s, *Gem.path].uniq.join(Gem.path_separator) }
+    gem 'spring', match[1]
+    require 'spring/binstub'
   end
 end