Update README.md badges

Author: electronjoe

README.md

@@ -5,8 +5,11 @@
 * Work in Progress
 * Scott Moeller
 
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 ## Summary
 
@@ -211,4 +214,4 @@ No attempt to detect overflow or underflow is applied - can this be done (transf
 * [Arithmetic operations for floating-point intervals](http://grouper.ieee.org/groups/1788/PositionPapers/ArithOp2.pdf)
 * [Interval Arithmetic: from Principles to Implementation](http://fab.cba.mit.edu/classes/S62.12/docs/Hickey_interval.pdf)
 * [Union, intersection and complementary of intervals](https://www.sangakoo.com/en/unit/union-intersection-and-complementary-of-intervals)
-* [Interval @ Wolfram](http://mathworld.wolfram.com/Interval.html)
+* [Interval @ Wolfram](http://mathworld.wolfram.com/Interval.html)