Update README.md

made little correction in answer of 150.  where property would be 
"[object Object]"  not "object Object"

Author: rahiljakir

README.md

@@ -4973,11 +4973,11 @@ console.log(animals[dog])
 
 Object keys are converted to strings. 
 
-Since the value of  `dog` is an object,  `animals[dog]` actually means that we’re creating a new property called `"object Object"` equal to the new object. `animals["object Object"]` is now equal to `{ emoji: "🐶", name: "Mara"}`.
+Since the value of  `dog` is an object,  `animals[dog]` actually means that we’re creating a new property called `"[object Object]"` equal to the new object. `animals["[object Object]"]` is now equal to `{ emoji: "🐶", name: "Mara"}`.
 
-`cat` is also an object, which means that `animals[cat]` actually means that we’re overwriting the value of  `animals["object Object"]` with the new cat properties. 
+`cat` is also an object, which means that `animals[cat]` actually means that we’re overwriting the value of  `animals["[object Object]"]` with the new cat properties. 
 
-Logging `animals[dog]`, or actually `animals["object Object"]` since converting the `dog` object to a string results `"object Object"`, returns the `{ emoji: "🐈", name: "Sara" }`.
+Logging `animals[dog]`, or actually `animals["[object Object]"]` since converting the `dog` object to a string results `"[object Object]"`, returns the `{ emoji: "🐈", name: "Sara" }`.
 
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