Remove \pm and \mp as they caused test regression

Will review the cases later

Author: delfanbaum

latex2mathml/converter.py

@@ -45,10 +45,8 @@
     r"\lvert",
     r"\lVert",
     r"\lvertneqq",
-    r"\mp",
     r"\ngeqq",
     r"\omicron",
-    r"\pm",
     r"\rvert",
     r"\rVert",
     r"\S",