Attempted rework of conanfile

conanfile.py

@@ -19,7 +19,7 @@ class ArbutilsConan(ConanFile):
         if self.settings.os == "Windows":
             self.output.warn("Noticed Windows target, setting Cmake WINDOWS=On.")
             cmake.definitions["WINDOWS"] = "On"
-        if self.options["shared"]:
+        if self.options.shared:
             self.output.info("Building shared library.")
             cmake.definitions["SHARED"] = "On"
         else: