Add relx improvements

Add ability to config relx in-line options by setting RELX_OPTS
Fix using RELX_CONFIG variable
Use relx 0.5.0 

1 files changed, 2 insertions, 0 deletions

diff --git a/README.md b/README.md
index 00711a4..3b0c694 100644
--- a/README.md
+++ b/README.md
@@ -198,6 +198,8 @@ file is fetched.
 `RELX_URL` is the location where `relx` can be downloaded if it is
 not found locally.
 
+`RELX_OPTS` is for setting relx in-line options, if any.
+
 Extra targets
 -------------