The very cryptic error message in Travis CI.:
No Rakefile found (looking for: rakefile, Rakefile, rakefile.rb, Rakefile.rb)
handlet's is a problem with incorrect indentation in the travis.yml file:
matrix: include: - php: 5.6 env: - SYMFONY_VERSION='3.4.*'
A space in the line – SYMFONY_VERSION = ’ 3.4. *.’ and this little revealing error.