Update edalize requirement to 0.2.4

Edalize 0.2.3 has a bug which prevents more than one script to run,
which is fixed in later versions.

Signed-off-by: Philipp Wagner <phw@lowrisc.org>
diff --git a/python-requirements.txt b/python-requirements.txt
index 1c71d21..091c9b9 100644
--- a/python-requirements.txt
+++ b/python-requirements.txt
@@ -44,7 +44,7 @@
 git+https://github.com/lowRISC/fusesoc.git@ot#egg=fusesoc >= 1.12.0
 
 # Development version with OT-specific changes
-git+https://github.com/lowRISC/edalize.git@ot#egg=edalize >= 0.2.3
+git+https://github.com/lowRISC/edalize.git@ot#egg=edalize >= 0.2.4
 
 # Development version of ChipWhisperer toolchain
 # Use a development version until support for the CW310 board works in a