modify var to const keyword (#197)

I noticed the second edition of the book had the const keyword when creating variables for arrow functions. This has not been updated in the github repo so i decided to make these changes

Author: oluseguncodess

chapter-02/03-arrow-functions/01-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Regular Function
 
-    var lordify = function(firstname) {
+    const lordify = function(firstname) {
       return `${firstname} of Canterbury`
     }
 

chapter-02/03-arrow-functions/02-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Arrow Function
 
-    var lordify = firstname => `${firstname} of Canterbury`
+    const lordify = firstname => `${firstname} of Canterbury`
 
     console.log( lordify("Dana") )
     console.log( lordify("Daphne") )

chapter-02/03-arrow-functions/03-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Function
 
-    var lordify = function(firstName, land) {
+    const lordify = function(firstName, land) {
       return `${firstName} of ${land}`
     }
 

chapter-02/03-arrow-functions/04-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Arrow Function
 
-    var lordify = (firstName, land) => `${firstName} of ${land}`
+    const lordify = (firstName, land) => `${firstName} of ${land}`
 
     console.log( lordify("Debbie", "Texas") )
     console.log( lordify("Daphne", "Susanville") )

chapter-02/03-arrow-functions/05-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Function
 
-    var lordify = function(firstName, land) {
+    const lordify = function(firstName, land) {
 
       if (!firstName) {
         throw new Error('A firstName is required to lordify')

chapter-02/03-arrow-functions/06-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Arrow Function
 
-    var lordify = (firstName, land) => {
+    const lordify = (firstName, land) => {
 
       if (!firstName) {
         throw new Error('A firstName is required to lordify')

chapter-02/03-arrow-functions/07-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Function
 
-    var tahoe = {
+    const tahoe = {
       resorts: ["Kirkwood","Squaw","Alpine","Heavenly","Northstar"],
       print: function(delay=1000) {
 

chapter-02/03-arrow-functions/08-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Function Solution with bind
 
-    var tahoe = {
+    const tahoe = {
       resorts: ["Kirkwood","Squaw","Alpine","Heavenly","Northstar"],
       print: function(delay=1000) {
 

chapter-02/03-arrow-functions/09-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Arrow Function 
 
-    var tahoe = {
+    const tahoe = {
       resorts: ["Kirkwood","Squaw","Alpine","Heavenly","Northstar"],
       print: function(delay=1000) {
 

chapter-02/03-arrow-functions/10-arrows.html

@@ -13,7 +13,7 @@ <h1>Arrow Functions</h1>
 
     // Arrow Functions gone too far, this means window
 
-    var tahoe = {
+    const tahoe = {
       resorts: ["Kirkwood","Squaw","Alpine","Heavenly","Northstar"],
       print: (delay=1000) => {