include library(arithmetic) in the overview

Many thanks to @notoria for these very useful predicates!

diff --git a/README.md b/README.md
index a48295c9568293a15791136adc1dc1c3ba2d7de5..6772ed717ef991d253fd9778007f5c08c6eac19e 100644 (file)
--- a/README.md
+++ b/README.md
@@ -360,6 +360,9 @@ The modules that ship with Scryer Prolog are also called
   CLP(B): Constraint Logic Programming over Boolean variables,
   a BDD-based SAT solver provided via the predicates
   `sat/1`, `taut/2`, `labeling/1` etc.
+* [`arithmetic`](src/prolog/lib/arithmetic.pl)
+  Arithmetic predicates such as `lsb/2`, `msb/2` and
+  `number_to_rational/2`.
 * [`time`](src/prolog/lib/time.pl)
   `time/1` reports the CPU time of a goal. It is useful
   for measuring the performance of your code.