Fix readme environment variables table formatting

go.sum

@@ -1,29 +1,44 @@
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@@ -33,7 +48,9 @@ github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
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@@ -70,11 +87,13 @@ golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKG
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