Grammar improvements.

Projects/1-Beginner/Bin2Dec-App.md

@@ -13,7 +13,7 @@ and 1's, in any sequence and then displays its decimal equivalent.
 This challenge requires that the developer implementing it follow these
 constraints:
 
--   Arrays may not be used to contain the binary digits entered by the user
+-   Arrays may not be used to contain the binary digits entered by the user.
 -   Determining the decimal equivalent of a particular binary digit in the
     sequence must be calculated using a single mathematical function, for
     example the natural logarithm. It's up to you to figure out which function
@@ -21,13 +21,13 @@ constraints:
 
 ## User Stories
 
--   [ ] User can enter up to 8 binary digits in one input field
--   [ ] User must be notified if anything other than a 0 or 1 was entered
--   [ ] User views the results in a single output field containing the decimal (base 10) equivalent of the binary number that was entered
+-   [ ] User can enter up to 8 binary digits in one input field.
+-   [ ] User must be notified if anything other than a 0 or 1 was entered.
+-   [ ] User views the results in a single output field containing the decimal (base 10) equivalent of the binary number that was entered.
 
 ## Bonus features
 
--   [ ] User can enter a variable number of binary digits
+-   [ ] User can enter a variable number of binary digits.
 
 ## Useful links and resources