Introduce myself (@gulin.serge)

Added myself to GHC-HQ list according to invitation by @doyougnu

team.mkd

@@ -40,6 +40,7 @@ a member of the team.
 | Ryan Scott            | @RyanGlScott        | deriving, Template Haskell                            |
 | Sam Derbyshire        | @sheaf              | typechecker, renamer, primops, records, representation polymorphism, pattern-match checking                                                      |
 | Sebastian Graf        | @sgraf812           | Core and STG analysis and optimisation, pattern-match checking, levity polymorphism, performance |
+| Serge S. Gulin        | @gulin.serge        | JS backend, modularity, bundle size, ECMA-compatibility facilitation |
 | Simon Peyton Jones    | @simonpj            | renamer, typechecker, simplifier                      |
 | Sven Tennie           | @supersven          | ghc-heap, closure-related parts of RTS, native code generation backends |
 | Sylvain Henry         | @hsyl20             | JS backend, performance, modularity, ghc-bignum       |