base: Add changelog entry for 4.8.2.0

libraries/base/changelog.md

@@ -82,6 +82,16 @@
 
   * The `MINIMAL` definition of `ArrowChoice` is now `left OR (+++)`.
 
+## 4.8.2.0  *Oct 2015*
+
+  * Bundled with GHC 7.10.3
+
+  * The restore operation provided by `mask` and `uninterruptibleMask` now
+    restores the previous masking state whatever the current masking state is.
+
+  * Exported `GiveGCStats`, `DoCostCentres`, `DoHeapProfile`, `DoTrace`,
+    `RtsTime`, and `RtsNat` from `GHC.RTS.Flags`
+
 ## 4.8.1.0  *Jul 2015*
 
   * Bundled with GHC 7.10.2