fix 'from' method

Author: shikhalev

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    is-enum (0.8.4)
+    is-enum (0.8.6)
 
 GEM
   remote: https://rubygems.org/
@@ -46,7 +46,7 @@ DEPENDENCIES
 CHECKSUMS
   diff-lcs (1.6.2) sha256=9ae0d2cba7d4df3075fe8cd8602a8604993efc0dfa934cff568969efb1909962
   docile (1.4.1) sha256=96159be799bfa73cdb721b840e9802126e4e03dfc26863db73647204c727f21e
-  is-enum (0.8.4)
+  is-enum (0.8.6)
   rake (13.3.1) sha256=8c9e89d09f66a26a01264e7e3480ec0607f0c497a861ef16063604b1b08eb19c
   redcarpet (3.6.1) sha256=d444910e6aa55480c6bcdc0cdb057626e8a32c054c29e793fa642ba2f155f445
   rspec (3.13.2) sha256=206284a08ad798e61f86d7ca3e376718d52c0bc944626b2349266f239f820587

is-enum.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification::new do |s|
   s.name = "is-enum"
-  s.version = "0.8.4"
+  s.version = "0.8.6"
   s.summary = "Enum types for Ruby"
   s.description = "Enum types for Ruby."
   s.authors = ["Ivan Shikhalev"]

lib/is-enum.rb

@@ -61,7 +61,7 @@ def from value
       when Enumerable
         value.map { |v| from(v) }
       else
-        raise ArgumentError, "Invalid value of #{ self }: #{ value.inspect }", caller_locations
+        self[value]
       end
     end