fix toString calls on Type objects in smoke

pkg/smoke/CHANGELOG.md

-# changelog
+#### 0.2.1+1
+  * Fix toString calls on Type instances.
 
-This file contains highlights of what changes on each version of this package.
-
-#### Pub version 0.2.0+3
+#### 0.2.0+3
   * Widen the constraint on analyzer.
 
-#### Pub version 0.2.0+2
+#### 0.2.0+2
   * Widen the constraint on barback.
 
-#### Pub version 0.2.0+1
+#### 0.2.0+1
   * Switch from `source_maps`' `Span` class to `source_span`'s `SourceSpan`
     class.
 
-#### Pub version 0.2.0
+#### 0.2.0
   * Static configuration can be modified, so code generators can split the
     static configuration in pieces.
   * **breaking change**: for codegen call `writeStaticConfiguration` instead of
     `writeInitCall`.
 
-#### Pub version 0.1.0
+#### 0.1.0
   * Initial release: introduces the smoke API, a mirror based implementation, a
     statically configured implementation that can be declared by hand or be
     generated by tools, and libraries that help generate the static
     configurations.