Update Travis for Moodle 3.9

[justusdieckmann]

No description provided.

[codecov-commenter]

Codecov Report

Merging #53 into master will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master      #53      +/-   ##
============================================
- Coverage     18.13%   18.07%   -0.06%     
  Complexity      453      453              
============================================
  Files            43       43              
  Lines          3986     3988       +2     
============================================
- Hits            723      721       -2     
- Misses         3263     3267       +4     

Impacted Files	Coverage Δ	Complexity Δ
post.php	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
classes/observer.php	63.33% <0.00%> (-1.19%)	9.00% <0.00%> (ø%)
lib.php	2.58% <0.00%> (-0.90%)	0.00% <0.00%> (ø%)
classes/readtracking.php	29.62% <0.00%> (-0.19%)	61.00% <0.00%> (ø%)
locallib.php	6.52% <0.00%> (+<0.01%)	0.00% <0.00%> (ø%)
classes/privacy/data_export_helper.php	98.27% <0.00%> (+<0.01%)	40.00% <0.00%> (ø%)
classes/privacy/provider.php	82.08% <0.00%> (+0.10%)	16.00% <0.00%> (ø%)
classes/ratings.php	4.29% <0.00%> (+0.29%)	91.00% <0.00%> (ø%)

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[justusdieckmann]

Ready to merge in my opinion.
A new release is needed because of 52510e8.

Changelog:

• Bugfix