Update README.md

* README.md: a few grammatical changes to the main Ruby README.md.
  [Fix GH-1259]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53878 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sat Feb 20 14:40:44 2016  Adam O'Connor  <northband@gmail.com>
+
+	* README.md: a few grammatical changes to the main Ruby README.md.
+	  [Fix GH-1259]
+
 Sat Feb 20 13:04:22 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* dir.c (push_pattern, push_glob): deal with read paths as UTF-8

README.md

@@ -60,7 +60,7 @@ http://www.ruby-lang.org/
 
 ## Mailing list
 
-There is a mailing list to talk about Ruby. To subscribe this list, please
+There is a mailing list to talk about Ruby. To subscribe to this list, please
 send the following phrase:
 
     subscribe
@@ -103,7 +103,7 @@ This is what you need to do to compile and install Ruby:
 
 8.  Run '`make install`'
 
-    This command will create following directories and install files onto
+    This command will create the following directories and install files into
     them.
 
     *   `${DESTDIR}${prefix}/bin`