Update convert-source-map to v1.0.0
Update convert-source-map to v1.0.0

Includes some performance improvements.
thlorenz/convert-source-map#931a1de

(try-catch is one of the optimization killer on V8.)

realtymaps/gulp-sourcemaps,gulp-sourcemaps/gulp-sourcemaps,floridoo/gulp-sourcemaps,floridoo/gulp-sourcemaps,IveWong/gulp-sourcemaps,phizaz/gulp-sourcemaps,opiants/gulp-sourcemaps,honger05/gulp-sourcemaps,jbenet/gulp-sourcemaps,realtymaps/gulp-sourcemaps,KCypher13/gulp-sourcemaps,gulp-sourcemaps/gulp-sourcemaps,gulp-sourcemaps/gulp-sourcemaps,realtymaps/gulp-sourcemaps,floridoo/gulp-sourcemaps