package/gnuplot: bump version to 6.0.4

For release note, see:
http://www.gnuplot.info/ReleaseNotes_6_0_4.html

Signed-off-by: Michael Fischer <mf@go-sys.de>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/gnuplot/gnuplot.hash

@@ -1,6 +1,6 @@
-# From https://sourceforge.net/projects/gnuplot/files/gnuplot/6.0.3/
-md5  c897ca69062010e2cf5f7483e39e5acc  gnuplot-6.0.3.tar.gz
-sha1  b31779d6760f432f57136600fc0c2bf65f4d4013  gnuplot-6.0.3.tar.gz
-sha256  ec52e3af8c4083d4538152b3f13db47f6d29929a3f6ecec5365c834e77f251ab  gnuplot-6.0.3.tar.gz
+# From https://sourceforge.net/projects/gnuplot/files/gnuplot/6.0.4/
+md5  3a42b32f5d5a003bb88717fce350c3fd  gnuplot-6.0.4.tar.gz
+sha1  b199107483eaa70273d644f1cba259c19e64a178  gnuplot-6.0.4.tar.gz
+sha256  458d94769625e73d5f6232500f49cbadcb2b183380d43d2266a0f9701aeb9c5b  gnuplot-6.0.4.tar.gz
 # Locally computed
 sha256  895928ec0735cca1c8cec42656c7e314a065d0242813bb8693c0c1bf61fd4e4d  Copyright

package/gnuplot/gnuplot.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-GNUPLOT_VERSION = 6.0.3
+GNUPLOT_VERSION = 6.0.4
 GNUPLOT_SITE = http://downloads.sourceforge.net/project/gnuplot/gnuplot/$(GNUPLOT_VERSION)
 GNUPLOT_LICENSE = gnuplot license (open source)
 GNUPLOT_LICENSE_FILES = Copyright