Code cleanup due to Crystal >= 0.28.0

spec/driver_spec.cr

@@ -19,13 +19,7 @@ describe Driver do
     assert_filename("sqlite3:/path/to/file.db", "/path/to/file.db")
     assert_filename("sqlite3:///path/to/file.db", "/path/to/file.db")
 
-    {% if compare_versions(Crystal::VERSION, "0.28.0") >= 0 %}
-      # Before 0.28.0 the filename had the query string in this case
-      # but it didn't bother when deleting the file in pool_spec.cr.
-      # After 0.28.0 the behavior is changed, but can't be fixed prior that
-      # due to the use of URI#opaque.
-      assert_filename("sqlite3:./file.db?max_pool_size=5", "./file.db")
-    {% end %}
+    assert_filename("sqlite3:./file.db?max_pool_size=5", "./file.db")
     assert_filename("sqlite3:/path/to/file.db?max_pool_size=5", "/path/to/file.db")
     assert_filename("sqlite3://./file.db?max_pool_size=5", "./file.db")
     assert_filename("sqlite3:///path/to/file.db?max_pool_size=5", "/path/to/file.db")

spec/pool_spec.cr

@@ -21,12 +21,7 @@ describe DB::Pool do
       fibers.times { channel.receive }
 
       # all numbers were inserted
-      s : Int32
-      {% if compare_versions(Crystal::VERSION, "0.28.0") >= 0 %}
-        s = fibers * max_n * (max_n + 1) // 2
-      {% else %}
-        s = fibers * max_n * (max_n + 1) / 2
-      {% end %}
+      s = fibers * max_n * (max_n + 1) // 2
       db.scalar("select sum(n) from numbers").should eq(s)
 
       # numbers were not inserted one fiber at a time

src/sqlite3/connection.cr

@@ -9,15 +9,7 @@ class SQLite3::Connection < DB::Connection
   end
 
   def self.filename(uri : URI)
-    {% if compare_versions(Crystal::VERSION, "0.28.0") >= 0 %}
-      URI.unescape((uri.host || "") + uri.path)
-    {% else %}
-      URI.unescape (if path = uri.path
-        (uri.host || "") + path
-      else
-        uri.opaque.not_nil!
-      end)
-    {% end %}
+    URI.unescape((uri.host || "") + uri.path)
   end
 
   def build_prepared_statement(query)