Renamed Travis in order to migrate to GH Actions (a token-free system)

.old_travis.yml

@@ -0,0 +1,16 @@
+# Documentation: http://docs.travis-ci.com/user/languages/julia/
+language: julia
+os:
+  - linux
+julia:
+  - 1.0
+  - 1.1
+  - nightly
+notifications:
+  email: false
+# uncomment the following lines to override the default test script
+#script:
+#  - if [[ -a .git/shallow ]]; then git fetch --unshallow; fi
+#  - julia -e 'Pkg.clone(pwd()); Pkg.build("ClassicalCiphers"); Pkg.test("ClassicalCiphers"; coverage=true)'
+after_success:
+- julia -e 'cd(Pkg.dir("ClassicalCiphers")); Pkg.add("Coverage"); using Coverage; Coveralls.submit(process_folder())'