travis: install libcurl-dev

diff --git a/.travis.yml b/.travis.yml
index c0690bd4654790a2f5e46aeaf157a5849dfd28d5..0d3157bb76781edbe177f4d7a9e9cb330ae6f27c 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,14 @@ sudo: false
 
 language: php
 
+addons:
+  apt:
+    packages:
+    - libcurl4-gnutls-dev
+
 php:
   - 7.0
+  - 7.1
   - nightly
 
 matrix: