rel(1.2.2): Update changelog

Author: oesteban

Diff for: doc/changelog/1.X.X-changelog

@@ -3,6 +3,7 @@
 
 ##### [Full changelog](https://github.com/nipy/nipype/milestone/33?closed=1)
 
+  * FIX: Ensure ``loadpkl`` returns a not None value (https://github.com/nipy/nipype/pull/3020)
   * FIX: ``loadpkl`` failed when pklz file contained versioning info (https://github.com/nipy/nipype/pull/3017)
   * FIX: Update mne.WatershedBEM command line (https://github.com/nipy/nipype/pull/3007)
   * FIX: Specify correct stop criterion flag in PETPVC (https://github.com/nipy/nipype/pull/3010)