upgrade go to 1.14

Author: wjrjerome

go.mod

@@ -1,6 +1,6 @@
 module github.com/XinFinOrg/XDC-Subnet
 
-go 1.13
+go 1.14
 
 require (
 	bazil.org/fuse v0.0.0-20180421153158-65cc252bf669

rpc/constants_unix.go

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
+//go:build darwin || dragonfly || freebsd || linux || nacl || netbsd || openbsd || solaris
 // +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
 
 package rpc

rpc/constants_unix_nocgo.go

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
 
+//go:build !cgo && !windows
 // +build !cgo,!windows
 
 package rpc