remove travisCI as we can use github actions full time

.travis.yml

@@ -1,20 +0,0 @@
-dist: bionic
-language: python
-cache: pip
-matrix:
-  allow_failures:
-    - python: 'nightly'
-  include:
-  - python: 'nightly'
-    env: TEST_SUITE=suite_3_9
-
-before_install:
-- pip install -r requirements/dev.txt
-install:
-- python setup.py test
-script:
-- python theHarvester.py -d apple.com -b baidu,bing,bufferoverun,certspotter,crtsh,dnsdumpster,dogpile,duckduckgo,exalead,linkedin,netcraft,intelx,threatcrowd,trello,twitter,virustotal,yahoo,rapiddns,qwant
-  -l 200
-- pytest
-- flake8 . --count --show-source --statistics
-- mypy --pretty theHarvester/discovery/*.py