fix: Fix relativeTime plugin Math.round bug

* fix: Fix relativeTime plugin error Math.round bug

* chore: add comment

* chore: add 'day' will ignore decimal by dayjs at current version

src/plugin/relativeTime/index.js

@@ -37,14 +37,15 @@ export default (o, c, d) => {
     let out
 
     for (let i = 0; i < Tl; i += 1) {
-      const t = T[i]
+      let t = T[i]
       if (t.d) {
         result = isFrom
           ? d(input).diff(instance, t.d, true)
           : instance.diff(input, t.d, true)
       }
-      const abs = Math.ceil(Math.abs(result))
+      const abs = Math.round(Math.abs(result))
       if (abs <= t.r || !t.r) {
+        if (abs === 1) t = T[i - 1] // 1 minutes -> a minute
         out = loc[t.l].replace('%d', abs)
         break
       }

test/plugin/relativeTime.test.js

@@ -17,16 +17,28 @@ it('Time from X', () => {
   const T = [
     [0, 'second'], // a few seconds
     [44, 'second'], // a few seconds
+    [44.4, 'second'], // a few seconds
+    [44.5, 'second'], // a minute
     [45, 'second'], // a minute
     [89, 'second'], // a minute
+    [89.4, 'second'], // a minute
+    [89.5, 'second'], // a minute
     [90, 'second'], // 2 minutes
     [44, 'minute'], // 44 minutes
+    [44.4, 'minute'],
+    [44.5, 'minute'],
     [45, 'minute'], // an hour
     [89, 'minute'], // an hour
+    [89.4, 'minute'],
+    [89.5, 'minute'],
     [90, 'minute'], // 2 hours
     [21, 'hour'], // 21 hours
+    [21.4, 'hour'],
+    [21.5, 'hour'],
     [22, 'hour'], // a day
     [35, 'hour'], // a day
+    [35.4, 'hour'],
+    [35.5, 'hour'],
     [36, 'hour'], // 2 days
     [25, 'day'], // 25 days
     [26, 'day'], // a month