Do not use the @github: notation in yarn.lock

The little advantage is that from a clean dir a `yarn install` won't
modify the `yarn.lock` file.

yarn.lock

@@ -11,7 +11,7 @@
     node-pre-gyp "~0.6.30"
     protozero "1.5.1"
 
-"@carto/tilelive-bridge@github:cartodb/tilelive-bridge#2.5.1-cdb4":
+"@carto/tilelive-bridge@cartodb/tilelive-bridge#2.5.1-cdb4":
   version "2.5.1-cdb4"
   resolved "https://codeload.github.com/cartodb/tilelive-bridge/tar.gz/3eb554e5109199f50f457cec72ee288cffa5d6b3"
   dependencies:
@@ -23,7 +23,7 @@
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/@mapbox/sphericalmercator/-/sphericalmercator-1.0.5.tgz#70237b9774095ed1cfdbcea7a8fd1fc82b2691f2"
 
-"abaculus@github:cartodb/abaculus#2.0.3-cdb5":
+abaculus@cartodb/abaculus#2.0.3-cdb5:
   version "2.0.3-cdb5"
   resolved "https://codeload.github.com/cartodb/abaculus/tar.gz/b899cbea04b3e6093aa3ef32331920acd5f839a1"
   dependencies:
@@ -249,7 +249,7 @@ camshaft@0.61.4:
     dot "^1.0.3"
     request "2.85.0"
 
-"canvas@github:cartodb/node-canvas#1.6.2-cdb2":
+canvas@cartodb/node-canvas#1.6.2-cdb2:
   version "1.6.2-cdb2"
   resolved "https://codeload.github.com/cartodb/node-canvas/tar.gz/8acf04557005c633f9e68524488a2657c04f3766"
   dependencies:
@@ -275,7 +275,7 @@ carto@CartoDB/carto#0.15.1-cdb1:
     optimist "~0.6.0"
     underscore "~1.6.0"
 
-"carto@github:cartodb/carto#0.15.1-cdb3":
+carto@cartodb/carto#0.15.1-cdb3:
   version "0.15.1-cdb3"
   resolved "https://codeload.github.com/cartodb/carto/tar.gz/945f5efb74fd1af1f5e1f69f409f9567f94fb5a7"
   dependencies:
@@ -2239,7 +2239,7 @@ through@2:
   version "2.3.8"
   resolved "https://registry.yarnpkg.com/through/-/through-2.3.8.tgz#0dd4c9ffaabc357960b1b724115d7e0e86a2e1f5"
 
-"tilelive-mapnik@github:cartodb/tilelive-mapnik#0.6.18-cdb8":
+tilelive-mapnik@cartodb/tilelive-mapnik#0.6.18-cdb8:
   version "0.6.18-cdb8"
   resolved "https://codeload.github.com/cartodb/tilelive-mapnik/tar.gz/9cb4546c8fdd34ced0a41dbf70e143475b4e2067"
   dependencies: