Release preparation: Fixed release date.

Change-Id: I5b0730b6c752fbee4a6a4697ea97048bdf72fe2a
diff --git a/ARM.CMSIS.pdsc b/ARM.CMSIS.pdsc
index 7a37173..b3ca667 100644
--- a/ARM.CMSIS.pdsc
+++ b/ARM.CMSIS.pdsc
@@ -8,7 +8,7 @@
   <url>http://www.keil.com/pack/</url>
 
   <releases>
-    <release version="5.5.0-rc1" release="2019-03-15">
+    <release version="5.5.0-rc1" date="2019-03-15">
       The following folders have been removed:
         - CMSIS/Include/ (superseded by CMSIS/DSP/Include/ and CMSIS/Core/Include/)
         - CMSIS/Lib/ (superseded by CMSIS/DSP/Lib/)