Upgrade to telepath 0.20.0 so simple selection changes aren't undone

This version of telepath adds an `undo: 'combine'` option which becomes
the default for marker changes. With an undo strategy of 'combine', the
operation is only undone when combined in a transaction with other
operations that are undone. This prevents simple marker updates from
getting pushed to the undo stack.

package.json

@@ -35,7 +35,7 @@
     "season": "0.14.0",
     "semver": "1.1.4",
     "space-pen": "2.0.0",
-    "telepath": "0.19.0",
+    "telepath": "0.20.0",
     "temp": "0.5.0",
     "underscore-plus": "0.2.0"
   },

src/editor.coffee

@@ -720,9 +720,9 @@ class Editor extends View
       selectedText = @getSelectedText()
       @hiddenInput.css('width', '100%')
     @hiddenInput.on 'compositionupdate', (e) =>
-      @insertText(e.originalEvent.data, {select: true, skipUndo: true})
+      @insertText(e.originalEvent.data, {select: true, undo: 'skip'})
     @hiddenInput.on 'compositionend', =>
-      @insertText(selectedText, {select: true, skipUndo: true})
+      @insertText(selectedText, {select: true, undo: 'skip'})
       @hiddenInput.css('width', '1px')
 
     lastInput = ''

src/selection.coffee

@@ -1,5 +1,6 @@
 {Range} = require 'telepath'
 {Emitter} = require 'emissary'
+{pick} = require 'underscore'
 
 # Public: Represents a selection in the {EditSession}.
 module.exports =
@@ -297,8 +298,8 @@ class Selection
   #    + autoDecreaseIndent:
   #      if `true`, decreases indent level appropriately (for example, when a
   #      closing bracket is inserted)
-  #    + skipUndo:
-  #      if `true`, skips the undo stack for this operation.
+  #    + undo:
+  #      if `skip`, skips the undo stack for this operation.
   insertText: (text, options={}) ->
     oldBufferRange = @getBufferRange()
     @editSession.destroyFoldsContainingBufferRow(oldBufferRange.end.row)
@@ -309,7 +310,7 @@ class Selection
     if options.indentBasis? and not options.autoIndent
       text = @normalizeIndents(text, options.indentBasis)
 
-    newBufferRange = @editSession.buffer.change(oldBufferRange, text, skipUndo: options.skipUndo)
+    newBufferRange = @editSession.buffer.change(oldBufferRange, text, pick(options, 'undo'))
     if options.select
       @setBufferRange(newBufferRange, isReversed: wasReversed)
     else