fix release version value

version value is fetched from git commit's tag

build.xml

@@ -1,15 +1,11 @@
 <?xml version="1.0"?>
 
 <project name="BoxBilling" default="build" basedir=".">
-    <tstamp>
-        <format property="version" pattern="4.M.d" />
-    </tstamp>
     <property environment="env" />
     <property name="build.dir" value="${basedir}/build" />
     <property name="dist.dir" value="${build.dir}/distribution" />
     <property name="documentation" value="${build.dir}/documentation" />
     <property name="source" value="${build.dir}/source" />
-    <property name="release" value="${version}" />
 
     <fileset id="shared-artifacts" dir=".">
         <include name="LICENSE"/>
@@ -134,6 +130,12 @@
         <copy todir="${source}">
             <fileset refid="api-sources"/>
         </copy>
+
+        <exec executable="git" outputproperty="release" >
+            <arg line="describe --abbrev=0"/>
+        </exec>
+        <echo message="Release version: ${release}" />
+
         <exec executable="sed" failonerror="true" output="${source}/bb-library/Box/Version2.php">
             <arg line="s/0.0.1/${release}/ ${source}/bb-library/Box/Version.php" />
         </exec>