adjust CI configuration

glessard · glessard · commit b0e33aa0ce5a · 2018-10-20T06:26:16.000-06:00
diff --git a/.travis.yml b/.travis.yml
@@ -27,6 +27,7 @@ matrix:
 
     - os: osx
       osx_image: xcode10
+      env: SWIFT_VERSION=4.2
 
 before_install:
   - clang --version
diff --git a/Package.swift b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:4.2
+// swift-tools-version:4.0
 
 import PackageDescription
 
