Fix 0.7 deprecations (#53)

* Fix 0.7 deprecations

* isabstract -> isabstracttype
* isconcrete -> isconcretetype
* module_name -> nameof

* Compat for Markdown/Pkg stdlib packages

Removes deprecations on Julia 0.7.

REQUIRE

@@ -1,2 +1,2 @@
 julia 0.6
-Compat 0.33 # Compat.Test
+Compat 0.50 # isabstracttype / isconcretetype / nameof

src/DocStringExtensions.jl

@@ -78,6 +78,7 @@ module DocStringExtensions
 # Imports.
 
 using Compat
+@static if VERSION >= v"0.7.0-DEV.3656" using Pkg end
 
 
 # Exports.

src/abbreviations.jl

@@ -73,7 +73,7 @@ function format(::TypeFields, buf, doc)
     # On 0.7 fieldnames() on an abstract type throws an error. We then explicitly return
     # an empty vector to be consistent with the behaviour on v0.6.
     # Compat necessary since Base.isabstract was introduced in v0.6.
-    local fields = Compat.TypeUtils.isabstract(object) ? Symbol[] : fieldnames(object)
+    local fields = isabstracttype(object) ? Symbol[] : fieldnames(object)
     if !isempty(fields)
         println(buf)
         for field in fields
@@ -136,7 +136,7 @@ function format(::ModuleExports, buf, doc)
         # Sorting ignores the `@` in macro names and sorts them in with others.
         for sym in sort(exports, by = s -> lstrip(string(s), '@'))
             # Skip the module itself, since that's always exported.
-            sym === module_name(object) && continue
+            sym === nameof(object) && continue
             # We print linked names using Documenter.jl cross-reference syntax
             # for ease of integration with that package.
             println(buf, "  - [`", sym, "`](@ref)")

src/utilities.jl

@@ -105,7 +105,7 @@ $(:SIGNATURES)
 
 Is the type `t` a `bitstype`?
 """
-isbitstype(@nospecialize(t)) = isconcrete(t) && sizeof(t) > 0 && isbits(t)
+isbitstype(@nospecialize(t)) = isconcretetype(t) && sizeof(t) > 0 && isbits(t)
 
 """
 $(:SIGNATURES)

test/runtests.jl

@@ -1,4 +1,5 @@
 using DocStringExtensions
 using Compat.Test
+@static if VERSION >= v"0.7.0-DEV.3589" using Markdown end
 
 include("tests.jl")