Build: Bump master to 5.4.99

Author: furszy

build-aux/snap/snapcraft.yaml

@@ -2,7 +2,7 @@
 # Copyright (c) 2019 The PIVX developers
 name: pivx-core
 base: core18
-version: 5.3.99
+version: 5.4.99
 summary:   PIVX (Private – Instant – Verified – Transaction)
 description: |
   PIVX is an MIT licensed,

configure.ac

@@ -1,7 +1,7 @@
 dnl require autoconf 2.60 (AS_ECHO/AS_ECHO_N)
 AC_PREREQ([2.60])
 define(_CLIENT_VERSION_MAJOR, 5)
-define(_CLIENT_VERSION_MINOR, 3)
+define(_CLIENT_VERSION_MINOR, 4)
 define(_CLIENT_VERSION_REVISION, 99)
 define(_CLIENT_VERSION_BUILD, 0)
 define(_CLIENT_VERSION_RC, 0)