Can't parse a pcb file generated from 5.0.2+dfsg1-1 (debian stable)

[tjwoodall]

diff --git a/pykicad/pcb.py b/pykicad/pcb.py
index 18f437b..f28e648 100644
--- a/pykicad/pcb.py
+++ b/pykicad/pcb.py
@@ -454,7 +454,7 @@ class PcbPlotParams(AST):
                 'useauxorigin': boolean('useauxorigin'),
                 'hpglpennumber': integer,
                 'hpglpenspeed': integer,
-                'hpglpendiameter': integer,
+                'hpglpendiameter': number,
                 'psnegative': boolean('psnegative'),
                 'psa4output': boolean('psa4output'),
                 'plotreference': boolean('plotreference'),

This is what the file looks like(snippet)
(mode 1)
(useauxorigin false)
(hpglpennumber 1)
(hpglpenspeed 20)
(hpglpendiameter 15.000000)
(psnegative false)
(psa4output false)
(plotreference true)
(plotvalue true)
(plotinvisibletext false)
(padsonsilk false)
(subtractmaskfromsilk false)