Fix incorrect scope of dev dependencies

[rockjam]

The library is being published to Clojars with dev dependencies - loudmoauth, ring, clojure tools, see image:

This PR addresses it, now dev dependencies are tagged with "test" scope, see diff of lein deps :tree before and after:
deps-before.txt
deps-after.txt

20,21c20,21
<  [loudmoauth "0.1.3"]
<    [prismatic/schema "1.1.2"]
---
>  [loudmoauth "0.1.3" :scope "test"]
>    [prismatic/schema "1.1.2" :scope "test"]
28,31c28,31
<  [org.clojure/tools.namespace "1.0.0"]
<    [org.clojure/java.classpath "1.0.0"]
<    [org.clojure/tools.reader "1.3.2"]
<  [org.clojure/tools.nrepl "0.2.13"]
---
>  [org.clojure/tools.namespace "1.0.0" :scope "test"]
>    [org.clojure/java.classpath "1.0.0" :scope "test"]
>    [org.clojure/tools.reader "1.3.2" :scope "test"]
>  [org.clojure/tools.nrepl "0.2.13" :scope "test"]
33,49c33,49
<  [ring "1.8.2"]
<    [ring/ring-core "1.8.2"]
<      [commons-fileupload "1.4"]
<      [crypto-equality "1.0.0"]
<      [crypto-random "1.2.0"]
<      [ring/ring-codec "1.1.2"]
<    [ring/ring-devel "1.8.2"]
<      [clj-stacktrace "0.2.8"]
<      [hiccup "1.0.5"]
<      [ns-tracker "0.4.0"]
<    [ring/ring-jetty-adapter "1.8.2"]
<      [org.eclipse.jetty/jetty-server "9.4.31.v20200723"]
<        [javax.servlet/javax.servlet-api "3.1.0"]
<        [org.eclipse.jetty/jetty-http "9.4.31.v20200723"]
<          [org.eclipse.jetty/jetty-util "9.4.31.v20200723"]
<        [org.eclipse.jetty/jetty-io "9.4.31.v20200723"]
<    [ring/ring-servlet "1.8.2"]
---
>  [ring "1.8.2" :scope "test"]
>    [ring/ring-core "1.8.2" :scope "test"]
>      [commons-fileupload "1.4" :scope "test"]
>      [crypto-equality "1.0.0" :scope "test"]
>      [crypto-random "1.2.0" :scope "test"]
>      [ring/ring-codec "1.1.2" :scope "test"]
>    [ring/ring-devel "1.8.2" :scope "test"]
>      [clj-stacktrace "0.2.8" :scope "test"]
>      [hiccup "1.0.5" :scope "test"]
>      [ns-tracker "0.4.0" :scope "test"]
>    [ring/ring-jetty-adapter "1.8.2" :scope "test"]
>      [org.eclipse.jetty/jetty-server "9.4.31.v20200723" :scope "test"]
>        [javax.servlet/javax.servlet-api "3.1.0" :scope "test"]
>        [org.eclipse.jetty/jetty-http "9.4.31.v20200723" :scope "test"]
>          [org.eclipse.jetty/jetty-util "9.4.31.v20200723" :scope "test"]
>        [org.eclipse.jetty/jetty-io "9.4.31.v20200723" :scope "test"]
>    [ring/ring-servlet "1.8.2" :scope "test"]