Update torch requirement from <=1.4.0,>1.3.1 to >1.3.1,<1.6.0 (#4118)

* Update torch requirement from <=1.4.0,>1.3.1 to >1.3.1,<1.6.0

Updates the requirements on [torch](/~https://github.com/pytorch/pytorch) to permit the latest version.
- [Release notes](/~https://github.com/pytorch/pytorch/releases)
- [Commits](pytorch/pytorch@v1.4.0a0...v1.5.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* try adding pip flag

* catch IndexError

* tighten torch pin

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Evan Pete Walsh <epwalsh10@gmail.com>

allennlp/modules/elmo.py

@@ -582,7 +582,7 @@ def forward(
                 type_representation, mask = add_sentence_boundary_token_ids(
                     embedded_inputs, mask_without_bos_eos, self._bos_embedding, self._eos_embedding
                 )
-            except RuntimeError:
+            except (RuntimeError, IndexError):
                 # Back off to running the character convolutions,
                 # as we might not have the words in the cache.
                 token_embedding = self._token_embedder(inputs)

setup.py

@@ -50,7 +50,7 @@
     license="Apache",
     packages=find_packages(exclude=["*.tests", "*.tests.*", "tests.*", "tests"]),
     install_requires=[
-        "torch>1.3.1,<=1.4.0",
+        "torch>1.3.1,<=1.5.0",
         "jsonnet>=0.10.0 ; sys.platform != 'win32'",
         "overrides==2.8.0",
         "nltk",