Fix minor typos

README.md

@@ -7,20 +7,20 @@ This is a simple utility to calculate the size of an item as [DynamoDB](https://
 ## Usage
 
 ```
-var dynoItemSize = require('dyno-item-size');
-var item = {
+const dynoItemSize = require('dyno-item-size');
+const item = {
   'string': 'string',
   'number': 27,
   'buffer': new Buffer('buffer', 'utf8')
 };
-var size = dynoItemSize(item);
+const size = dynoItemSize(item);
 console.log(size);
 // => 32
 ```
 
 ## API
 
-`dynoItemSize` comes with a two helper functions to translate the size of an object into it's read or write capacity cost.
+`dynoItemSize` comes with two helper functions to translate the size of an object into its read or write capacity cost.
 
 ### `dynoItemSize(object)`
 
@@ -38,7 +38,7 @@ Takes an object like the one shown in usage and returns the write capacity cost.
 
 This module has been implemented by reading a few resources.
 
-- [Item Size in DdynamoDB from stack overflow](http://stackoverflow.com/questions/8988389/itemsize-in-dynamodb)
-- [Provision Throughput from the AWS DynamoDB docs](http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.ProvisionedThroughput.html)
+- [Item Size in DynamoDB from Stack Overflow](http://stackoverflow.com/questions/8988389/itemsize-in-dynamodb)
+- [Provisioned Throughput from the AWS DynamoDB docs](http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.ProvisionedThroughput.html)
 - [Naming Rules and Data Types](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.NamingRulesDataTypes.html#HowItWorks.DataTypes)
 - [Item Sizes and Capacity Unit Consumption](https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/CapacityUnitCalculations.html#ItemSizeCalculations.Reads)