Update README.md

PeterIvanov · web-flow · commit 11ff6ec85b8d · 2018-10-31T17:58:02.000+03:00
diff --git a/README.md b/README.md
@@ -196,3 +196,5 @@ See godoc for other *errorx* features:
 * Panic-related utils
 * Type registry
 * etc.
+
+[Read the package documentation for more information](https://godoc.org/github.com/joomcode/errorx).
