bump elixir version to 1.9.0

.tool-versions

@@ -1,3 +1,3 @@
-elixir 1.8.1
+elixir 1.9
 erlang 21.0.4
 nodejs 10.11.0

apps/block_scout_web/mix.exs

@@ -15,7 +15,7 @@ defmodule BlockScoutWeb.Mixfile do
         plt_add_deps: :transitive,
         ignore_warnings: "../../.dialyzer-ignore"
       ],
-      elixir: "~> 1.8",
+      elixir: "~> 1.9",
       elixirc_paths: elixirc_paths(Mix.env()),
       lockfile: "../../mix.lock",
       package: package(),

apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/transport.ex

@@ -88,10 +88,6 @@ defmodule EthereumJSONRPC.Transport do
      `%{"id" => ..., "error" => reason}`.  The transport can also give any `term()` for `reason` if a more specific
      reason is possible.
 
-  """
-  @callback json_rpc(request, options) :: {:ok, result} | {:error, reason :: term()}
-
-  @doc """
   Runs a batch of Remote Procedure Call (RPC) `request`s with `options`.
 
   ## Returns
@@ -99,8 +95,9 @@ defmodule EthereumJSONRPC.Transport do
    * `{:ok, [response]}` unlike `json_rpc(request, options)`, the individual `t:response.t/0` are not unwrapped and it
      is the callers responsibility to extract the `t:result/0` or error `reason`.
    * `{:error, reason}` an error that affects *all* `t:request/0`s, such as the batch as a whole being rejected.
-
   """
+  @callback json_rpc(request, options) :: {:ok, result} | {:error, reason :: term()}
+
   @callback json_rpc(batch_request, options) :: {:ok, batch_response} | {:error, reason :: term()}
 
   @doc """

apps/ethereum_jsonrpc/mix.exs

@@ -15,7 +15,7 @@ defmodule EthereumJsonrpc.MixProject do
         plt_add_apps: [:mix],
         ignore_warnings: "../../.dialyzer-ignore"
       ],
-      elixir: "~> 1.8",
+      elixir: "~> 1.9",
       elixirc_paths: elixirc_paths(Mix.env()),
       lockfile: "../../mix.lock",
       preferred_cli_env: [

apps/explorer/mix.exs

@@ -15,7 +15,7 @@ defmodule Explorer.Mixfile do
         plt_add_apps: ~w(ex_unit mix)a,
         ignore_warnings: "../../.dialyzer-ignore"
       ],
-      elixir: "~> 1.8",
+      elixir: "~> 1.9",
       elixirc_paths: elixirc_paths(Mix.env()),
       lockfile: "../../mix.lock",
       package: package(),

apps/indexer/mix.exs

@@ -10,7 +10,7 @@ defmodule Indexer.MixProject do
       deps: deps(),
       deps_path: "../../deps",
       description: "Fetches block chain data from on-chain node for later reading with Explorer.",
-      elixir: "~> 1.8",
+      elixir: "~> 1.9",
       elixirc_paths: elixirc_paths(Mix.env()),
       lockfile: "../../mix.lock",
       preferred_cli_env: [

docs/requirements.md

@@ -5,7 +5,7 @@
 | Dependency  | Mac | Linux |
 |-------------|-----|-------|
 | [Erlang/OTP 21.0.4](https://github.com/erlang/otp) | `brew install erlang` | [Erlang Install Example](https://github.com/poanetwork/blockscout-terraform/blob/33f68e816e36dc2fb055911fa0372531f0e956e7/modules/stack/libexec/init.sh#L134) |
-| [Elixir 1.8.1](https://elixir-lang.org/) | :point_up: | [Elixir Install Example](https://github.com/poanetwork/blockscout-terraform/blob/33f68e816e36dc2fb055911fa0372531f0e956e7/modules/stack/libexec/init.sh#L138) |
+| [Elixir 1.9.0](https://elixir-lang.org/) | :point_up: | [Elixir Install Example](https://github.com/poanetwork/blockscout-terraform/blob/33f68e816e36dc2fb055911fa0372531f0e956e7/modules/stack/libexec/init.sh#L138) |
 | [Postgres 10.3](https://www.postgresql.org/) | `brew install postgresql` | [Postgres Install Example](https://github.com/poanetwork/blockscout-terraform/blob/33f68e816e36dc2fb055911fa0372531f0e956e7/modules/stack/libexec/init.sh#L187) |
 | [Node.js 10.x.x](https://nodejs.org/en/) | `brew install node` | [Node.js Install Example](https://github.com/poanetwork/blockscout-terraform/blob/33f68e816e36dc2fb055911fa0372531f0e956e7/modules/stack/libexec/init.sh#L66) |
 | [Automake](https://www.gnu.org/software/automake/) | `brew install automake` | [Automake Install Example](https://github.com/poanetwork/blockscout-terraform/blob/33f68e816e36dc2fb055911fa0372531f0e956e7/modules/stack/libexec/init.sh#L72) |

mix.exs

@@ -13,7 +13,7 @@ defmodule BlockScout.Mixfile do
         plt_add_apps: ~w(ex_unit mix)a,
         ignore_warnings: ".dialyzer-ignore"
       ],
-      elixir: "~> 1.8",
+      elixir: "~> 1.9",
       preferred_cli_env: [
         coveralls: :test,
         "coveralls.detail": :test,