Remove ASF license from github templates (PR and issues)

[mistercrunch]

It shows as people open issues and PRs and it's confusing... Hopefully the build is cool with this...

<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
-->

[kristw]

It isn't...

[michellethomas]

Yeah I wasn't sure how to get around this with the PR template, build requires all files to have the apache license header.

[mistercrunch]

Tried nuking the travis cache without success :(

[mistercrunch]

Ok, tried to delete the PR's cache on travis as well as the master cache, restarted the build...

[codecov-io]

Codecov Report

Merging #7217 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7217      +/-   ##
==========================================
- Coverage   64.62%   64.62%   -0.01%     
==========================================
  Files         422      422              
  Lines       20596    20593       -3     
  Branches     2253     2253              
==========================================
- Hits        13311    13309       -2     
+ Misses       7162     7161       -1     
  Partials      123      123

Impacted Files	Coverage Δ
superset/sql_lab.py	76.37% <0%> (-0.26%)	⬇️
superset/assets/src/explore/controls.jsx	42.4% <0%> (ø)	⬆️
.../src/explore/components/controls/SelectControl.jsx	83.52% <0%> (+0.97%)	⬆️

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[kristw]

🎉🎉🎉🎉🎉🎉🎉🎉🎉🎉