Fix up lint issues. (#77)

Fixed via `buildifier --lint=fix` with buildifier 0.19.2.1
diff --git a/BUILD b/BUILD
index cabe9f4..9dbe12d 100644
--- a/BUILD
+++ b/BUILD
@@ -1,9 +1,9 @@
+load("//:bzl_library.bzl", "bzl_library")
+
 licenses(["notice"])  # Apache 2.0
 
 package(default_visibility = ["//visibility:public"])
 
-load("//:bzl_library.bzl", "bzl_library")
-
 exports_files([
     "LICENSE",
     "lib.bzl",
diff --git a/lib.bzl b/lib.bzl
index d99e498..9cffa0e 100644
--- a/lib.bzl
+++ b/lib.bzl
@@ -24,8 +24,8 @@
 load("//lib:shell.bzl", _shell = "shell")
 load("//lib:structs.bzl", _structs = "structs")
 load("//lib:types.bzl", _types = "types")
-load("//lib:versions.bzl", _versions = "versions")
 load("//lib:unittest.bzl", _asserts = "asserts", _unittest = "unittest")
+load("//lib:versions.bzl", _versions = "versions")
 
 print(
     "WARNING: lib.bzl is deprecated and will go away in the future, please" +
diff --git a/lib/BUILD b/lib/BUILD
index ff49e88..df0c640 100644
--- a/lib/BUILD
+++ b/lib/BUILD
@@ -1,9 +1,9 @@
+load("//:bzl_library.bzl", "bzl_library")
+
 licenses(["notice"])
 
 package(default_visibility = ["//visibility:public"])
 
-load("//:bzl_library.bzl", "bzl_library")
-
 filegroup(
     name = "test_deps",
     testonly = True,
diff --git a/lib/unittest.bzl b/lib/unittest.bzl
index 32a0ec8..7489890 100644
--- a/lib/unittest.bzl
+++ b/lib/unittest.bzl
@@ -19,8 +19,8 @@
 assertions used to within tests.
 """
 
-load(":sets.bzl", "sets")
 load(":new_sets.bzl", new_sets = "sets")
+load(":sets.bzl", "sets")
 
 def _make(impl, attrs = None):
     """Creates a unit test rule from its implementation function.
diff --git a/tests/BUILD b/tests/BUILD
index 19e4ac5..e845dc2 100644
--- a/tests/BUILD
+++ b/tests/BUILD
@@ -1,10 +1,10 @@
 load(":collections_tests.bzl", "collections_test_suite")
 load(":dicts_tests.bzl", "dicts_test_suite")
+load(":new_sets_tests.bzl", "new_sets_test_suite")
 load(":partial_tests.bzl", "partial_test_suite")
 load(":paths_tests.bzl", "paths_test_suite")
 load(":selects_tests.bzl", "selects_test_suite")
 load(":sets_tests.bzl", "sets_test_suite")
-load(":new_sets_tests.bzl", "new_sets_test_suite")
 load(":shell_tests.bzl", "shell_test_suite")
 load(":structs_tests.bzl", "structs_test_suite")
 load(":types_tests.bzl", "types_test_suite")