feat(structuredPatch): Handle default context option

Author: Kiougar

src/patch/create.js

@@ -4,7 +4,7 @@ export function structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHea
   if (!options) {
     options = {};
   }
-  if (!options.context) {
+  if (typeof options.context === 'undefined') {
     options.context = 4;
   }