We no longer use Travis-CI, remove its configuration

.travis.yml

@@ -1,15 +0,0 @@
-language: c
-addons:
-  apt:
-    packages:
-    - libident-dev
-    - libpam0g-dev
-    - libssl-dev
-    - libwrap0-dev
-    - zlib1g-dev
-    - expect
-    - telnet
-compiler:
-  - gcc
-  - clang
-script: ./autogen.sh && ./configure --enable-ipv6 --with-iconv --with-ident --with-openssl --with-pam --with-tcp-wrappers --with-zlib && make check