remove the "don't precompile" warning note:

that was only bc I used PyPlot fork (pr 480) in sysimg

JuliaPy/PyPlot.jl#480

Author: tfiers

src/Sciplotlib.jl

@@ -1,14 +1,3 @@
-# A note on precompilation and __init__.
-#
-# If Sciplotlib is used in another module, then that module must be marked as
-# `__precompile__(false)`. If not, during precompilation of that top-level module,
-# Sciplotlib's `__init__` will be called [*], which is a function that cannot be called
-# during a precompilation phase; it errors then.
-#
-# [*] Strange but true. Strange cause `__init__` is explicitly made to not be called during
-#     precompilation. It indeed is not called when precompiling Sciplotlib itself. But it
-#     _does_ get called when precompiling a downstream package.
-
 module Sciplotlib
 
 using Reexport