Update metadata (copyright)

also remove trailing empty lines in test files

t/airline.vim

@@ -84,4 +84,3 @@ describe 'airline'
     Expect airline#statusline(1) =~ 'airline#check_mode'
   end
 end
-

t/builder.vim

@@ -105,4 +105,3 @@ describe 'inactive builder'
     Expect stl == '%#Normal_inactive#hello%#foo_inactive#fooworld'
   end
 end
-

t/commands.vim

@@ -32,4 +32,3 @@ describe 'commands'
     Expect exists(':AirlineRefresh') to_be_true
   end
 end
-

t/extensions_default.vim

@@ -28,4 +28,3 @@ describe 'default'
     wincmd c
   end
 end
-

t/highlighter.vim

@@ -18,4 +18,3 @@ describe 'highlighter'
     Expect hlID('airline_c_red') != 0
   end
 end
-

t/init.vim

@@ -86,4 +86,3 @@ describe 'init parts'
     Expect g:airline_section_z =~ 'bar'
   end
 end
-

t/parts.vim

@@ -36,4 +36,3 @@ describe 'parts'
     Expect airline#parts#get('part').accent == 'red'
   end
 end
-

t/section.vim

@@ -78,4 +78,3 @@ describe 'section'
     Expect s == '%{airline#util#prepend(airline#parts#ffenc(),0)}%{strftime("%H:%M")}'
   end
 end
-

t/themes.vim

@@ -70,4 +70,3 @@ describe 'themes'
     Expect map.airline_z[0] == 6
   end
 end
-

t/util.vim

@@ -51,4 +51,3 @@ describe 'util'
     Expect airline#util#wrap('foo', 99999) == ''
   end
 end
-