fix(reporter): lower max dots per line from 100 to 80 (#40)

The original version from PR gh-31 used 100 dots per line, which doesn't
fit in all terminals; 80 is a more sensible default.

If the terminal is wider, it will just produce more dotted lines than
necessary. If the terminal is narrower and the whole line doesn't fit,
though, the dots wrap and then end mid-line which looks much worse.

Ref gh-31

Author: mgol

reporter.js

@@ -2,7 +2,7 @@ import chalk from "chalk";
 import { prettyMs } from "./lib/prettyMs.js";
 import * as Diff from "diff";
 
-const MAX_DOTS_PER_LINE = 100;
+const MAX_DOTS_PER_LINE = 80;
 
 function serializeForDiff( value ) {