Changelog: 1.0.1

Adds a draft for the changelog of the 1.0.1 release.

CHANGELOG.md

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+Changelog for the openPMD Standard
+==================================
+
+1.0.1
+-----
+**Date:** 2017-XX-YY
+
+Typo and wording changes for the 1.0.0 release
+
+Revisions are reserved for typos and clarification in the standard (but not for changes in keywords).
+
+## Changes to "1.0.0"
+
+### Base Standard
+
+- **backwards compatible changes:**
+  - better examples for `axisLabels` #153
+  - unspecified (user-chosen) `float`/`uint`/`int` are now called `floatX`/`uintX`/`intX` throughout the standard #152
+  - note to store non-openPMD information outside the `basePath` #115
+  - particle position: update python example #119 #127
+  - particle patches: typo in reference to `positionOffset` #135
+
+### Extension
+
+- `ED-PIC`:
+  - **backwards compatible changes:**
+    - `fieldSmoothing`: typo in allowed values #131
+    - `fieldSolver`: typo in PSATD description #133
+    - reference updated to unspecified (user-chosen) `float`/`uint`/`int` as in base standard #152
+
+### Data Converter
+
+No data conversion needed.