Update changelog.
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Changes in current version of Apache Libcloud
---------------------------------------------
+General
+~~~~~~~
+
+- Fix caching of auth tokens in the Google Compute Engine drivers. Now we make
+ sure that the file is truncated before writing a new token. Not truncating
+ the file would cause issues if the new token is shorted then the existing one
+ which is cached in the file.
+ (GITHUB-844, LIBCLOUD-835)
+ [Paul Tiplady]
+
Compute
~~~~~~~
