steveej-t480s-work: upgrade to nixos 19.03

nix/home-manager/programs/chromium.nix

@@ -9,7 +9,7 @@
 
   nixpkgs.config = {
     chromium = {
-      enablePepperPDF = true;
+      # 2019-03-05: missing on 19.03 enablePepperPDF = true;
       enablePepperFlash = false;
     };
   };

nix/home-manager/programs/neovim.nix

@@ -93,6 +93,8 @@ in {
               "sha256" = "181siphb87yzln9433159ssa6vmm1h2dd0kqhlx7bgsi51gng4rv";
             };
           };
+
+          tlib = vimPlugins.tlib_vim;
         };
 
         pluginDictionaries = let 
@@ -126,7 +128,7 @@ in {
             "git-blame"
 
             # Nix
-            "vim-addon-nix"
+            "vim-addon-nix" "tlib"
             "vim-addon-vim2nix"
 
             # LaTeX
@@ -146,7 +148,7 @@ in {
             "vim-markdown-toc"
 
             # misc syntax support
-            "vim-bazel"
+            "vim-bazel" "maktaba"
           ];
         in [
           { names = default; }