Postgres 10 Support

[sidmutha]

I was trying to install the output plugin on Postgres 10 and got the following compile error:

src/replisome.c: In function ‘rs_decode_change’:
src/replisome.c:772:9: error: too many arguments to function ‘ExecEvalExpr’
   res = ExecEvalExpr(entry->exprstate, econtext, &isnull, NULL);
         ^~~~~~~~~~~~
In file included from src/executor.h:4:0,
                 from src/replisome.c:19:
/usr/include/postgresql/10/server/executor/executor.h:285:1: note: declared here
 ExecEvalExpr(ExprState *state,
 ^~~~~~~~~~~~
<builtin>: recipe for target 'src/replisome.o' failed
make: *** [src/replisome.o] Error 1

I guess Postgres 10 isn't currently supported?