New feature: FETCH() permits http gets in dnsconfig.js (#1007)

add PANIC() and error-handled FETCH()

go.sum

@@ -67,10 +67,14 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
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@@ -105,6 +109,8 @@ github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:ma
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@@ -273,6 +279,7 @@ github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:
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@@ -357,6 +364,7 @@ github.com/nbio/st v0.0.0-20140626010706-e9e8d9816f32 h1:W6apQkHrMkS0Muv8G/TipAy
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@@ -419,8 +427,12 @@ github.com/tdewolff/test v1.0.6 h1:76mzYJQ83Op284kMT+63iCNCI7NEERsIN8dLM+RiKr4=
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@@ -789,6 +801,7 @@ gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22 h1:VpOs+IwYnYBaFnrNAeB8UUWtL3
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