Do a final pass over the changelogs

libraries/base/changelog.md

 # Changelog for [`base` package](http://hackage.haskell.org/package/base)
 
-## 4.12.0.0 *TBA*
-  * Bundled with GHC *TBA*
+## 4.12.0.0 *August 2018*
+  * Bundled with GHC 8.6.1
 
   * The STM invariant-checking mechanism (`always` and `alwaysSucceeds`), which
     was deprecated in GHC 8.4, has been removed (as proposed in
@@ -28,8 +28,8 @@
   * `asinh` for `Float` and `Double` is now numerically stable in the face of
     non-small negative arguments and enormous arguments of either sign. (#14927)
 
-  * `Numeric.showEFloat (Just 0)` now respects the user's requested precision.
-    (#15115)
+	* `Numeric.showEFloat (Just 0)` and `Numeric.showGFloat (Just 0)`
+    now respect the user's requested precision. (#15115)
 
   * `Data.Monoid.Alt` now has `Foldable` and `Traversable` instances. (#15099)
 
@@ -42,13 +42,13 @@
     `Read1`, `Show1`, `Generic`, `Generic1`. (#15098)
 
 
-## 4.11.1.0 *TBA*
+## 4.11.1.0 *April 2018*
   * Bundled with GHC 8.4.2
 
   * Add the `readFieldHash` function to `GHC.Read` which behaves like
     `readField`, but for a field that ends with a `#` symbol (#14918).
 
-## 4.11.0.0 *TBA*
+## 4.11.0.0 *March 2018*
   * Bundled with GHC 8.4.1
 
   * `System.IO.openTempFile` is now thread-safe on Windows.

libraries/ghc-boot-th/changelog.md

-## 8.0.1  *May 2016*
-
-  * Bundled with GHC 8.0.1
-
-  * Initial version

libraries/ghc-boot-th/ghc-boot-th.cabal.in

@@ -19,7 +19,6 @@ description:    This library contains various bits shared between the @ghc@ and
                 be depended upon by user code.
 cabal-version:  >=1.10
 build-type:     Simple
-extra-source-files: changelog.md
 
 source-repository head
     type:     git

libraries/ghc-boot/changelog.md

+## 8.6.1  *August 2018*
+
+  * Bundled with GHC 8.6.1
+
+## 8.4.2  *April 2018*
+
+  * Bundled with GHC 8.4.2
+	
+## 8.4.1  *March 2018*
+
+  * Bundled with GHC 8.4.1
+
+## 8.2.2  *November 2018*
+
+  * Bundled with GHC 8.2.2
+
+## 8.2.1  *July 2017*
+
+  * Bundled with GHC 8.2.1
+
+## 8.0.2  *January 2017*
+
+  * Bundled with GHC 8.0.2
+
 ## 8.0.1  *May 2016*
 
   * Bundled with GHC 8.0.1

libraries/ghc-prim/changelog.md

-## 0.5.3 (edit as necessary)
+## 0.5.3 *August 2018*
 
 - Shipped with GHC 8.6.1
 
@@ -9,7 +9,7 @@
   Previously it returned empty pointer and non-pointer arrays
   for thunks.
 
-## 0.5.2.0
+## 0.5.2.0 *March 2018*
 
 - Shipped with GHC 8.4.1
 

libraries/template-haskell/changelog.md

 # Changelog for [`template-haskell` package](http://hackage.haskell.org/package/template-haskell)
 
-## 2.14.0.0 *TBA*
+## 2.14.0.0 *August 2018*
 
   * Introduce an `addForeignFilePath` function, as well as a corresponding
     `qAddForeignFile` class method to `Quasi`. Unlike `addForeingFile`, which