Remove 'weekend'

These challenges are used by devs other than academy devs – it should make sense to them too

README.md

@@ -1,7 +1,6 @@
 Chitter Challenge
 =================
 
-* Challenge time: rest of the day and weekend, until Monday 9am
 * Feel free to use Google, your notes, books, etc. but work on your own
 * If you refer to the solution of another coach or student, please put a link to that in your README
 * If you have a partial solution, **still check in a partial solution**
@@ -56,9 +55,9 @@ I want to receive an email if I am tagged in a Peep
 Technical Approach:
 -----
 
-This week you integrated a database into Bookmark Manager using the `PG` gem and `SQL` queries. You can continue to use this approach when building Chitter Challenge.
+In this unit, you integrated a database into Bookmark Manager using the `PG` gem and `SQL` queries. You can continue to use this approach when building Chitter Challenge.
 
-If you'd like more technical challenge this weekend, try using an [Object Relational Mapper](https://en.wikipedia.org/wiki/Object-relational_mapping) as the database interface.
+If you'd like more technical challenge now, try using an [Object Relational Mapper](https://en.wikipedia.org/wiki/Object-relational_mapping) as the database interface.
 
 Some useful resources:
 **DataMapper**
@@ -100,7 +99,7 @@ In code review we'll be hoping to see:
 * High [Test coverage](https://github.com/makersacademy/course/blob/master/pills/test_coverage.md) (>95% is good)
 * The code is elegant: every class has a clear responsibility, methods are short etc.
 
-Reviewers will potentially be using this [code review rubric](docs/review.md).  Referring to this rubric in advance may make the challenge somewhat easier.  You should be the judge of how much challenge you want this weekend.
+Reviewers will potentially be using this [code review rubric](docs/review.md).  Referring to this rubric in advance may make the challenge somewhat easier.  You should be the judge of how much challenge you want at this moment.
 
 Automated Tests:
 -----