add downloadurl to xml.info's

extension-4.1/com.drastikbydesign.payment.stripe/info.xml

 <?xml version="1.0" encoding="utf-8"?>
 <extension key="com.drastikbydesign.payment.stripe" type="payment">
+  <downloadUrl>https://github.com/downloads/drastik/civicrm_stripe/com.drastikbydesign.payment.stripe-4.1.zip</downloadUrl>
   <file>stripe</file>
   <name>Stripe</name>
   <description>Stripe Payment Processor</description>
@@ -33,4 +34,4 @@
    <isRecur>1</isRecur>
    <paymentType>1</paymentType>
   </typeInfo>
-</extension>
\ No newline at end of file
+</extension>

extension-4.2/com.drastikbydesign.payment.stripe/info.xml

 <?xml version="1.0" encoding="utf-8"?>
 <extension key="com.drastikbydesign.payment.stripe" type="payment">
+  <downloadUrl>https://github.com/downloads/drastik/civicrm_stripe/com.drastikbydesign.payment.stripe-4.2.zip</downloadUrl>
   <file>stripe</file>
   <name>Stripe</name>
   <description>Stripe Payment Processor</description>
@@ -33,4 +34,4 @@
    <isRecur>1</isRecur>
    <paymentType>1</paymentType>
   </typeInfo>
-</extension>
\ No newline at end of file
+</extension>