update ChangeLog

ChangeLog

+chameleon-???
+------------------------------------------------------------------------
+
+- add timing drivers time_zpotrs_tile and time_zgeqrs_tile
+- deactivate warmup by default
+
 chameleon-0.9.1
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 r2253 | fpruvost | 2015-06-19 16:57:27 +0200 (ven. 19 juin 2015)