make error message for @types dependencies clearer (#653)

* make error message for @types dependencies clearer

* Add final-form to whitelist (#654)

* Try CRLF I guess

Author: dbartholomae

src/lib/definition-parser.ts

@@ -200,6 +200,7 @@ to refer to @types/P if it relies on old versions of P's types.
 In this case, please make a pull request to types-publisher adding @types/P to \`dependenciesWhitelist.txt\`.`
                 : `Dependency ${dependencyName} not in whitelist.
 If you are depending on another \`@types\` package, do *not* add it to a \`package.json\`. Path mapping should make the import work.
+For namespaced dependencies you then have to add a \`paths\` mapping from \`@namespace/library\` to \`namespace__library\` in \`tsconfig.json\`. 
 If this is an external library that provides typings,  please make a pull request to types-publisher adding it to \`dependenciesWhitelist.txt\`.`;
             throw new Error(`In ${path}: ${msg}`);
         }