Add description on requirements

mnogu · Oct 25, 2020 · 6a324ff · 6a324ff
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diff --git a/README.md b/README.md
@@ -1,5 +1,10 @@
 # go-calculator
 
+## Requirements
+
+* Go 1.14+
+  * for [`math.FMA()`](https://golang.org/pkg/math/#FMA)
+
 ## Usage
 
 ```