[Build] Bump master to 3.1.99

Now that 3.1 is branched off, set master to pre-3.2 (3.1.99) and bump up
 the gitian descriptor version to 3.2

Author: Fuzzbawls

configure.ac

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

contrib/gitian-descriptors/gitian-aarch64.yml

@@ -1,5 +1,5 @@
 ---
-name: "pivx-aarch64-3.1"
+name: "pivx-aarch64-3.2"
 enable_cache: true
 suites:
 - "xenial"

contrib/gitian-descriptors/gitian-linux.yml

@@ -1,5 +1,5 @@
 ---
-name: "pivx-linux-3.1"
+name: "pivx-linux-3.2"
 enable_cache: true
 suites:
 - "trusty"

contrib/gitian-descriptors/gitian-osx.yml

@@ -1,5 +1,5 @@
 ---
-name: "pivx-osx-3.1"
+name: "pivx-osx-3.2"
 enable_cache: true
 suites:
 - "trusty"

contrib/gitian-descriptors/gitian-win.yml

@@ -1,5 +1,5 @@
 ---
-name: "pivx-win-3.1"
+name: "pivx-win-3.2"
 enable_cache: true
 suites:
 - "trusty"