Fix command to run migrations

[pablodip]

User Story

As a develop/devops I want to be able to run migrations with lein run migrate, as it is specified here: http://www.luminusweb.net/docs/migrations.html

Description

This is important to separate running the app from running the migrations, that right now it is coupled, and everything the app is run, the migrations are run: https://github.com/status-im/open-bounty/blob/develop/src/clj/commiteth/db/core.clj#L29

Right now that command is broken with this output:

Exception in thread "main" java.lang.NullPointerException, compiling:(/private/var/folders/94/ynczyqvs09v8_7t8m21t5tt40000gn/T/form-init1764225723835109313.clj:1:125)
	at clojure.lang.Compiler.load(Compiler.java:7526)
	at clojure.lang.Compiler.loadFile(Compiler.java:7452)
	at clojure.main$load_script.invokeStatic(main.clj:278)
	at clojure.main$init_opt.invokeStatic(main.clj:280)
	at clojure.main$init_opt.invoke(main.clj:280)
	at clojure.main$initialize.invokeStatic(main.clj:311)
	at clojure.main$null_opt.invokeStatic(main.clj:345)
	at clojure.main$null_opt.invoke(main.clj:342)
	at clojure.main$main.invokeStatic(main.clj:424)
	at clojure.main$main.doInvoke(main.clj:387)
	at clojure.lang.RestFn.applyTo(RestFn.java:137)
	at clojure.lang.Var.applyTo(Var.java:702)
	at clojure.main.main(main.java:37)
Caused by: java.lang.NullPointerException
	at migratus.database$connect_STAR_.invokeStatic(database.clj:120)
	at migratus.database$connect_STAR_.invoke(database.clj:114)
	at migratus.database.Database.connect(database.clj:241)
	at migratus.core$run.invokeStatic(core.clj:24)
	at migratus.core$run.invoke(core.clj:21)
	at migratus.core$migrate.invokeStatic(core.clj:69)
	at migratus.core$migrate.invoke(core.clj:66)
	at luminus_migrations.core$migrate.invokeStatic(core.clj:73)
	at luminus_migrations.core$migrate.invoke(core.clj:52)
	at commiteth.core$_main.invokeStatic(core.clj:60)
	at commiteth.core$_main.doInvoke(core.clj:53)
	at clojure.lang.RestFn.invoke(RestFn.java:408)
	at clojure.lang.Var.invoke(Var.java:381)
	at user$eval30723.invokeStatic(form-init1764225723835109313.clj:1)
	at user$eval30723.invoke(form-init1764225723835109313.clj:1)
	at clojure.lang.Compiler.eval(Compiler.java:7062)
	at clojure.lang.Compiler.eval(Compiler.java:7052)
	at clojure.lang.Compiler.load(Compiler.java:7514)
	... 12 more

[status-open-bounty]

Balance: 0.000000 ETH
Tokens: SNT: 500.00
Contract address: 0x2927f27ee6931e4bcb53c78156bb3bcaaf6cda86
Network: Mainnet
Paid to: omartell
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