pen: update to v0.34.0

Update the pen package to upstream release v0.34.0 in order to fix the
following build error reported by the buildbot:

    ssl.o: In function `ssl_create_context':
    ssl.c:(.text+0x9c): undefined reference to `SSLv3_method'
    collect2: error: ld returned 1 exit status

Also switch from PKG_MD5SUM to PKG_HASH with SHA256 while we're at it.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

net/pen/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=pen
-PKG_VERSION:=0.29.0
+PKG_VERSION:=0.34.0
 PKG_RELEASE:=1
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=http://siag.nu/pub/pen/
-PKG_MD5SUM:=6040c43d80d62536afb4d4b1cf40c127
+PKG_HASH:=a3306bfb02619b103ff431002bb91079048bf2dd24f739bf38e373860558cd27
 
 PKG_LICENSE:=GPL-2.0+
 PKG_LICENSE_FILES:=COPYING