Update CHANGELOG

CHANGELOG.md

+# 1.0 RC 9
+
+New features
+
+* various improvements in handling of foreign objects in R
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+Added missing R builtins and C API
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+* eapply builtin
+* rapply builtin
+
+Bug fixes:
+
+* colon builtin calculated length incorrectly in some circumstances
+* `storage.mode<-` works with NULL
+* Rf_coerceVector works with pairlists and language objects
+* allow formal parameter names: '..1', '..1=default', '...=default'
+
 # 1.0 RC 8
 
 Bug fixes