Format long numbers. Updated README.

lib/format.js

@@ -39,3 +39,23 @@ export function formatShortTime(val, formats = ['m', 's'], space = '') {
 
   return t;
 }
+
+export function formatNumber(n) {
+  return Number(n).toFixed(0);
+}
+
+export function formatLongNumber(n) {
+  if (n >= 1000000) {
+    return `${(n / 1000000).toFixed(1)}m`;
+  }
+  if (n >= 100000) {
+    return `${(n / 1000).toFixed(0)}k`;
+  }
+  if (n >= 10000) {
+    return `${(n / 1000).toFixed(1)}k`;
+  }
+  if (n >= 1000) {
+    return `${(n / 1000).toFixed(2)}k`;
+  }
+  return formatNumber(n);
+}