Add Makefile target to regenerate the image used in the README

+ Switch to SVG format for higher quality.

Author: vterron

[2014] Classes in Python: You're Doing it Wrong/Makefile

@@ -11,11 +11,16 @@ CODE_OUTPUT=output
 PDFLATEX=pdflatex
 PDFLATEX_OPTS=-interaction=nonstopmode -halt-on-error -shell-escape
 
-TEX_FILE=python-clases.tex
+BASENAME=python-clases
+TEX_FILE=${BASENAME}.tex
+PDF_FILE=${BASENAME}.pdf
 
-.PHONY: all pdf clean
+.PHONY: all pdf clean cover
 
-all : pdf
+all : pdf cover
+
+cover: pdf
+	pdf2svg $(PDF_FILE) pics/cover.svg
 
 pdf: $(TEX_FILE)
 	$(OUTPUTS_SCRIPT) $(CODE_ROOT) $(CODE_OUTPUT)

[2014] Classes in Python: You're Doing it Wrong/README.rst

@@ -8,6 +8,6 @@ They are also `available as a PDF`__, always up-to-date (via git hooks).
 * Language: Spanish
 * License: `CC BY-SA 4.0 <http://creativecommons.org/licenses/by-sa/4.0/>`_
 
-.. |PDF| image:: ./pics/portada.png
+.. |PDF| image:: ./pics/cover.svg
 .. _PDF: http://www.iaa.es/~vterron/python-clases.pdf
 __ PDF_