Fix README

Author: jferard

README.rst

@@ -63,7 +63,7 @@ In a python script (see examples/examples.py):
 ----------
 The script
 ----------
-There is a mandatory blank line between instructions, but no semi colon is needed.
+There is a mandatory semicolon between instructions.
 
 SQL instructions
 ================
@@ -130,13 +130,13 @@ To use a custom python aggregate function in the script:
  $aggregate Class():
  def __init__(self):
  ...
+
  def step(self, v):
  ...
+
  def finalize(self):
  return ret
 
-Beware: do not put any blank line between methods.
-
 ``dump``
 --------
 Make a dump of the base: