Removed deprecated merge and merge_with on PMap
Removed deprecated merge and merge_with on PMap

jml/pyrsistent,Futrell/pyrsistent,tobgu/pyrsistent,Futrell/pyrsistent,jkbjh/pyrsistent,tobgu/pyrsistent,jml/pyrsistent,Futrell/pyrsistent,jkbjh/pyrsistent,tobgu/pyrsistent,jml/pyrsistent,jkbjh/pyrsistent