fix for reading temperature less than 10, because current cost adds a sp...

...ace before the temp number.
This is an example I'm getting during these cold days:
```XML
<msg><src>CC128-v1.44.05</src><dsb>00099</dsb><time>19:52:32</time><tmpr> 9.6</tmpr><sensor>0</sensor><id>01587</id><type>1</type><ch1><watts>00372</watts></ch1></msg>
```
Did you notice the blank space before 9.6? That was breaking the parsing, so I slightly edited the regex and added a trim to the string.

Thank you!