update developer guide

Author: chfw

Diff for: README.rst

@@ -220,28 +220,16 @@ Then install relevant development requirements:
 #. pip install -r requirements.txt
 #. pip install -r tests/requirements.txt
 
+Once you have finished your changes, please provide test case(s), relevant documentation
+and update CHANGELOG.rst.
 
-In order to update test environment, and documentation, additional steps are
-required:
+.. note::
 
-#. pip install moban
-#. git clone https://github.com/pyexcel/pyexcel-commons.git commons
-#. make your changes in `.moban.d` directory, then issue command `moban`
-
-What is rnd_requirements.txt
--------------------------------
+    As to rnd_requirements.txt, usually, it is created when a dependent
+	library is not released. Once the dependecy is installed
+	(will be released), the future
+	version of the dependency in the requirements.txt will be valid.
 
-Usually, it is created when a dependent library is not released. Once the dependecy is installed(will be released), the future version of the dependency in the requirements.txt will be valid.
-
-What is pyexcel-commons
----------------------------------
-
-Many information that are shared across pyexcel projects, such as: this developer guide, license info, etc. are stored in `pyexcel-commons` project.
-
-What is .moban.d
----------------------------------
-
-`.moban.d` stores the specific meta data for the library.
 
 How to test your contribution
 ------------------------------
@@ -256,6 +244,25 @@ On Windows systems, please issue this command::
 
     > test.bat
 
+How to update test environment and update documentation
+---------------------------------------------------------
+
+Additional steps are required:
+
+#. pip install moban
+#. git clone https://github.com/pyexcel/pyexcel-commons.git commons
+#. make your changes in `.moban.d` directory, then issue command `moban`
+
+What is pyexcel-commons
+---------------------------------
+
+Many information that are shared across pyexcel projects, such as: this developer guide, license info, etc. are stored in `pyexcel-commons` project.
+
+What is .moban.d
+---------------------------------
+
+`.moban.d` stores the specific meta data for the library.
+
 Acceptance criteria
 -------------------