README.md in dentaku-3.0.0 vs README.md in dentaku-3.1.0

@@ -4,12 +4,13 @@
 [![Join the chat at https://gitter.im/rubysolo/dentaku](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/rubysolo/dentaku?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Gem Version](https://badge.fury.io/rb/dentaku.png)](http://badge.fury.io/rb/dentaku)
 [![Build Status](https://travis-ci.org/rubysolo/dentaku.png?branch=master)](https://travis-ci.org/rubysolo/dentaku)
 [![Code Climate](https://codeclimate.com/github/rubysolo/dentaku.png)](https://codeclimate.com/github/rubysolo/dentaku)
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-[![Coverage Status](https://coveralls.io/repos/github/rubysolo/dentaku/badge.svg)](https://coveralls.io/github/rubysolo/dentaku)
+[![Coverage](https://codecov.io/gh/rubysolo/dentaku/branch/master/graph/badge.svg)](https://codecov.io/gh/rubysolo/dentaku)
 
+
 DESCRIPTION
 -----------
 
 Dentaku is a parser and evaluator for a mathematical and logical formula
 language that allows run-time binding of values to variables referenced in the
@@ -33,10 +34,20 @@
 ```ruby
 calculator.evaluate('kiwi + 5', kiwi: 2)
 #=> 7
 ```
 
+To enter a case sensitive mode, just pass an option to the calculator instance:
+
+```ruby
+calculator.evaluate('Kiwi + 5', Kiwi: -2, kiwi: 2)
+#=> 7
+calculator = Dentaku::Calculator.new(case_sensitive: true)
+calculator.evaluate('Kiwi + 5', Kiwi: -2, kiwi: 2)
+#=> 3
+```
+
 You can also store the variable values in the calculator's memory and then
 evaluate expressions against those stored values:
 
 ```ruby
 calculator.store(peaches: 15)
@@ -67,15 +78,18 @@
 #=> nil
 calculator.evaluate!('10 * x')
 Dentaku::UnboundVariableError: Dentaku::UnboundVariableError
 ```
 
-Dentaku has built-in functions (including `if`, `not`, `min`, `max`, and
+Dentaku has built-in functions (including `if`, `not`, `min`, `max`, `sum`, and
 `round`) and the ability to define custom functions (see below). Functions
 generally work like their counterparts in Excel:
 
 ```ruby
+calculator.evaluate('SUM(1, 1, 2, 3, 5, 8)')
+#=> 20
+
 calculator.evaluate('if (pears < 10, 10, 20)', pears: 5)
 #=> 10
 calculator.evaluate('if (pears < 10, 10, 20)', pears: 15)
 #=> 20
 ```
@@ -130,11 +144,11 @@
 
 Comparison: `<`, `>`, `<=`, `>=`, `<>`, `!=`, `=`,
 
 Logic: `IF`, `AND`, `OR`, `NOT`, `SWITCH`
 
-Numeric: `MIN`, `MAX`, `ROUND`, `ROUNDDOWN`, `ROUNDUP`
+Numeric: `MIN`, `MAX`, `SUM`, `ROUND`, `ROUNDDOWN`, `ROUNDUP`
 
 Selections: `CASE` (syntax see [spec](https://github.com/rubysolo/dentaku/blob/master/spec/calculator_spec.rb#L292))
 
 String: `LEFT`, `RIGHT`, `MID`, `LEN`, `FIND`, `SUBSTITUTE`, `CONCAT`, `CONTAINS`
 
@@ -264,9 +278,36 @@
 (However both of these are already built-in -- the `^` operator and the `MAX`
 function)
 
 Functions can be added individually using Calculator#add_function, or en masse
 using Calculator#add_functions.
+
+FUNCTION ALIASES
+----------------
+
+Every function can be aliased by synonyms. For example, it can be useful if 
+your application is multilingual.
+
+```ruby
+Dentaku.aliases = {
+  round: ['rrrrround!', 'округлить']
+}
+
+Dentaku('rrrrround!(8.2) + округлить(8.4)') # the same as round(8.2) + round(8.4)
+# 16
+```
+
+Also, if you need thread-safe aliases you can pass them to `Dentaku::Calculator`
+initializer:
+
+```ruby
+aliases = {
+  round: ['rrrrround!', 'округлить']
+}
+c = Dentaku::Calculator.new(aliases: aliases)
+c.evaluate('rrrrround!(8.2) + округлить(8.4)')
+# 16
+```
 
 THANKS
 ------
 
 Big thanks to [ElkStone Basements](http://www.elkstonebasements.com/) for