travis: optimizing .ci/install.sh

Author: staiyeba

.ci/install.sh

@@ -2,11 +2,9 @@
 
 set -e
 set -x
-#ls -A | grep -v src | xargs rm -r || :
 if [[ "$(uname -s)" == 'Darwin' ]]; then
     brew update || brew update
-    brew install cmake || true
+    brew install cmake || :
+    brew install python3 || :
 fi
-pip install conan --upgrade
-pip install conan_package_tools bincrafters_package_tools
-conan user
+pip3 install conan --upgrade