fix formatting

lib/exw3.ex

@@ -23,9 +23,9 @@ defmodule ExW3 do
     Enum.join(["0x", bytes |> Base.encode16(case: :lower)], "")
   end
 
-	@spec to_checksum_address(binary()) :: binary()
-	@doc "returns a checksummed address"
-	def to_checksum_address(address) do
+  @spec to_checksum_address(binary()) :: binary()
+  @doc "returns a checksummed address"
+  def to_checksum_address(address) do
     address = String.replace(address, ~r/^0x/, "")
 
     {:ok, hash} = Ethereumex.HttpClient.web3_sha3(String.downcase(address))
@@ -45,8 +45,8 @@ defmodule ExW3 do
     "0x" <> List.to_string(list_arr)
   end
 	
-	@doc "checks if the address is a valid checksummed address"
-	@spec is_valid_checksum_address(binary()) :: boolean()
+  @doc "checks if the address is a valid checksummed address"
+  @spec is_valid_checksum_address(binary()) :: boolean()
   def is_valid_checksum_address(address) do
     to_checksum_address(address) == address
   end