Remove mention of Travis in README

Closes #140

Author: lionel-

README.md

@@ -51,7 +51,7 @@ It is sometimes difficult to understand the cause of a doppelganger failure. A f
 
 * The plot depends on some system library. For instance sf plots depend on libraries like GEOS and GDAL. It might not be possible to test these plots with vdiffr (which can still be used for manual inspection, add a [testthat::skip()] before the `expect_doppelganger()` call in that case).
 
-To help you understand the causes of a failure, vdiffr automatically logs the SVG diff of all failures when run under R CMD check. The log is located in `tests/vdiffr.Rout.fail` and should be displayed on Travis.
+To help you understand the causes of a failure, vdiffr automatically logs the SVG diff of all failures when run under R CMD check. The log is located in `tests/vdiffr.Rout.fail` and should be displayed in your CI logs.
 
 You can also set the `VDIFFR_LOG_PATH` environment variable with `Sys.setenv()` to unconditionally (also interactively) log failures in the file pointed by the variable.