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There are some interesting numbers in this poll, beyond what is highlighted in the article:

Among every group in the poll, Trump has made progress in all but two groups: age 30-39 (lost 2%) and age 40-49 (no change). In the age 18-29 group, Trump has gained from 64%/25% in March, to (a statistically even) 45%/42% in May.
The article mentioned, but it is worth repeating: 8 percent of the people supporting Clinton in the primary defected to Trump. I think that's more interesting than the 20% of Sanders supporters defecting to Trump: it means that Trump's attack on Hillary are working.
Back in March, 4% of Trump's primary supporters were planning to defect to Clinton. Now, it's 0% -- meaning he has brought those people back.
Back in March, 20% of the Republicans supporting other than Trump were planning to vote for Clinton. Now, it's 11%. Either Trump has won over nearly half of them, or at least made Clinton unacceptable.
15% of Obama voters plan to vote for Trump, vs. only 6% of Romney voters planning to vote for Clinton. This is the first survey that asked that question, and it will be interesting to see the trend.
Trump peeling off more Democrats and Liberals than Clinton is peeling off from Republicans and Conservatives. And the trend is in Trump's favor.
Clinton is still winning among moderates, but she has lost a LOT of ground: from 61/27 in March to 49/39 in May. That's a "yuuuuge" change.
Among whites, Clinton is only ahead among women with college degrees. But, Trump has either closed or increased the margin among all whites since March.

I realize these are different sets of people in the March and May poll, so I'm writing "metaphorically" in some cases: Trump didn't necessarily change minds... it's just the differences in the two samples.

But, this is a huge improvement in 2 months, despite the circular firing squad with both Republicans and the Democrats. It will be interesting to see the next poll, and look at the trends.