Merge branch 'master' into more-encompassing-number-skips

script/travis/before_install

@@ -5,6 +5,8 @@ set -ex
 # Fetch all commits/refs needed to run our tests.
 git fetch origin master:master v2.0.0:v2.0.0 test/attributes:test/attributes test/master:test/master
 
+sudo apt-get update
+
 script/vendor-deb libicu48 libicu-dev
 if ruby -e 'exit RUBY_VERSION >= "2.0" && RUBY_VERSION < "2.1"'; then
   # Workaround for https://bugs.ruby-lang.org/issues/8074. We can't use this
@@ -15,6 +17,9 @@ else
   bundle config build.charlock_holmes --with-icu-dir=$(pwd)/vendor/debs
 fi
 
+# Replace SSH links to submodules by HTTPS links.
+sed -i 's/git@github.com:/https:\/\/github.com\//' .gitmodules
+
 git submodule init
 git submodule sync --quiet
 script/fast-submodule-update