Update boot version to 2.5.2, clarify supported boot versions in readme

Author: micha

README.md

@@ -2,7 +2,7 @@
 
 Boot executable—downloads and runs [Boot](http://boot-clj.com).
 
-* Compatible with any 2.x.x version of Boot.
+* Compatible with any version of Boot, 2.0.0 or later.
 * Unix / OSX / Linux / Windows
 
 | Operating System | Download |

src/Boot.java

@@ -13,7 +13,7 @@
 @SuppressWarnings("unchecked")
 public class Boot {
 
-    public static final String initialVersion = "2.5.0";
+    public static final String initialVersion = "2.5.2";
     public static final File   homedir        = new File(System.getProperty("user.home"));
     public static final File   workdir        = new File(System.getProperty("user.dir"));